The calculated probability that both tiles are even is 2/7
Calculating the probability that both tiles are even?from the question, we have the following parameters that can be used in our computation:
Tiles = 7
Even tiles = 4
So, we have
P(Even) = 4/7
Without replacement, we have
P(Even | Even) = 3/6
Simplify
P(Even | Even) = 1/2
Using the above as a guide, we have the following:
P(Even, Even) = 4/7 * 1/2
Evaluate the products
So, we have
P(Even, Even) = 2/7
Hence, the probability that both tiles are even is 2/7
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The parent function, f(x) = 5x has been vertically co
, shinted to the right three units and
down two unks.
Choose the correct function to reore
0 900 = 58h-2
P ao0-E)s -2
2 g00 - g8h -2
° g00 = 55r3 -2
The correct function to represent the transformation of the parent function f(x) = 5x after it has been vertically shifted down two units and horizontally shifted to the right three units is g(x) = 5(x-3)-2.
The horizontal shift of three units to the right is represented by the subtraction of three from the x value inside the parentheses, while the vertical shift of two units down is represented by the subtraction of two from the output value of the function. The parent function f(x) = 5x is a linear function with a slope of 5 and a y-intercept of 0.
The transformation of the function g(x) does not change the slope or y-intercept of the parent function but shifts it horizontally and vertically on the coordinate plane. Answering this question requires more than 100 words.
The parent function, f(x) = 5x, has been vertically shifted to the right three units and down two units. To represent this transformation, we can modify the original function as follows:
g(x) = 5(x - 3) - 2
This new function, g(x), is the correct representation of the parent function after the specified shifts. The original function, f(x) = 5x, has been transformed by shifting its graph horizontally to the right by three units and vertically downwards by two units.
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I need help ASAP, will give brainliest. Also please give reasoning
Answer: S and T.
Step-by-step explanation:
I watched a video on how to do this just to answer, so it might not be right LOL. But since the angles are the same if you draw them from each other they both show the angles are equal which means the lines are parallel.
51. The optimistic time for completion of Activity " \( X \) " on a PERT chart was 6 hours, the most likely time was for this same activity was 9 hours and the pessimistic time was 12 hours. Using the
The expected time for completion of Activity "X" on a PERT chart is 9 hours.
PERT analysis is a project management technique that is used to evaluate and analyze the tasks involved in finishing a project. It makes use of 3 duration estimates: optimistic, pessimistic, and most likely times to calculate the expected duration of each activity. These estimates are used to analyze the critical path, slack time, and schedule of the project.
Let's calculate the expected time for completion of Activity "X" on a PERT chart using the given estimates:
Optimistic time (O) = 6 hours
Most likely time (M) = 9 hours
Pessimistic time (P) = 12 hours
Expected time (TE) = [O + 4M + P] ÷ 6= [6 + 4(9) + 12] ÷ 6= [6 + 36 + 12] ÷ 6= 54 ÷ 6= 9
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The following table shows values for two functions, f(x) = x4 and g(x) = 4”, on the interval (0,6].
Which statement best describes the two functions?
As x increases, f(x) > g(x).
For x > 4, f(x) > g(x).
х
0
1
2.
4
6.
f(x)
0
1
16
? w
81
256 625 1,296
As x increases, g(x) > f(x).
g(x)
1
4
16
64 256 1,024 4,096
For 2 > 4, g(x) > f(x).
Done
Answer: it's the last one
For x > 4 g(x) > f(x) where f(x) is = x⁴ and g(x) is = 4ˣ.
What are the types of interval ?There are two types of interval open interval and closed interval.In open interval we do not include the points and in closed interval we include the given points.
According to the given question there are two functions f(x) = x⁴ and g(x) = 4ˣ and they are on the interval [0,6].
We can observe from the given table is that
g(x) > f(x) on the interval [0,1].
f(x) = g(x) when x is = 2 and 4.
f(x) > g(x) at x = 3.
And for x > 4, [5,6], g(x) > g(x).
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I need this asap 100 points + brainliest if its correct (;
A student is checking the shading on her graph of the solution of an inequality. The graph is shown. She chooses the value x = -17 to substitute. Will substituting this value back into the original inequality result in a true or a false statement? Explain your answer.
Answer:
Step-by-step explanation:
False
Answer:
False statement
Step-by-step explanation:
Currently, the inequality of the line is x < -18.75 like shown in the number line.
If you want to substitute -17 for x, you have to make sure it makes sense.
The inequality will be -17 < -18.75.
Now, is this inequality a true one? No, because -17 is not less than -18.75 making this a false statement.
You can also check with the number line in the image.
Does the line pass through -17?
The value of x + y is negative, and X is a
positive integer. What must be true about
y? Explain.
HELP FAST!!!
Answer:
'y' must be at least one more than 'x'
Step-by-step explanation:
example: let 'x' equal 4
in order for '4 - y' to be less than zero (a negative value) then the value of 'y' must 5 or less
4 - 5 = -1
Answer:
Y is a negative number that has a value greater than the opposite of X
Step-by-step explanation:
The graduates of the Languages department at North Academy must have taken a class in French, Swahili, or Nepali (possibly more than one). There are 35 students who graduated this year. Of them, 18 took French, while only 5 had all 3 languages. Of those students that attended Swahili, twice as many took French as did not, Sixteen did not learn Nepali, while any student who attended French class also took Swahili. (a) Create and complete a counting tree diagram for this situation. (b) Determine how many people took Swahili and Nepali, but not French. (c) Find n(F∩(S∪N
c
)). 2. ( 2 points) (a) Sameer has 5 rooms in his apartment, and has bought 3 different colour paints in order to decorate. He will only use one colour per room. In how many ways can he select the colours and paint each room in his house? (b) Lynn is painting his house, which has 7 different rooms, He has bought 5 different colours of paint he could use to paint each room in his house. Lynn wants to only use one colour per room, and wants to use exactly 2 paint colours overall. In how many ways can Lynn paint the rooms in his house?
Therefore, the total number of ways Lynn can paint the rooms in his house is 10 * 128 = 1280 ways.
(a) The counting tree diagram for this situation can be completed as follows:
- French (18)
/ \
- Swahili (12) Nepali (3)
/ \
- French (8) No French (4)
(b) To determine how many people took Swahili and Nepali, but not French, we need to subtract the number of students who took all three languages from the total number of students who took Swahili and Nepali.
From the given information, we know that 5 students took all three languages. Therefore, the number of people who took Swahili and Nepali, but not French, is 5.
(c) To find n(F∩(S∪N)), we need to find the intersection of French and the union of Swahili and Nepali.
From the given information, we know that any student who attended French class also took Swahili. Therefore, n(F∩(S∪N)) is equal to the number of students who took French.
Thus, n(F∩(S∪N)) is 18.
2. (a) Sameer has 5 rooms in his apartment and 3 different color paints. He can select one color per room.
Therefore, the number of ways he can select the colors and paint each room is equal to the number of color choices (3) raised to the power of the number of rooms (5).
Thus, there are 3⁵ = 243 ways Sameer can select the colors and paint each room in his house.
(b) Lynn has 7 different rooms in his house and 5 different colors of paint. He wants to use exactly 2 paint colors overall.
To calculate the number of ways Lynn can paint the rooms in his house, we need to consider the number of ways he can choose 2 colors out of the 5 available colors and then assign these 2 colors to the 7 different rooms.
The number of ways Lynn can choose 2 colors out of the 5 available colors is given by the combination formula:
C(5, 2) = 5! / (2! * (5 - 2)!)
= 10.
Once Lynn has chosen 2 colors, he can assign these colors to the 7 different rooms in 2⁷ = 128 ways (since each room can be painted with either of the 2 chosen colors).
Therefore, the total number of ways Lynn can paint the rooms in his house is 10 * 128 = 1280 ways.
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The radius of a circular clock is 10,5 inches. Which measurement is closest to the circumference of the clock in inches?
A. 33 in.
B.132 in.
C. 66 in.
D 346 in.
Solve the following equation 4×6x−7=1 x= log8log6 x= log2log6 x= log6log8 x= log6log2
Answer:
The value of x is \(x=\frac{\log(2)}{\log(6)}\).
Step-by-step explanation:
Solve the equation as follows:
\(4\times 6^{x}-7=1\)
\(4\times 6^{x}=7+1\)
\(6^{x}=\frac{8}{4}\)
\(6^{x}=2\)
Take log on both sides.
\(\log(6^{x})=\log(2)\)
\(x\log (6)=\log(2)\)
\(x=\frac{\log(2)}{\log(6)}\)
Thus, the value of x is \(x=\frac{\log(2)}{\log(6)}\).
Help, i just need the answers and no need for explanations.
Answer:
The equation of the quadratic function shown is;
x^2+ 2x -3
Step-by-step explanation:
Here in this question, we need to know the quadratic equation whose graph was shown.
The key to answering this lies in knowing the roots of the equation.
The roots of the equation are the solution to the quadratic equation and can be seen from the graph at the point where the quadratic equation crosses the x-axis.
The graph crosses the x-axis at two points.
These are at the points x = -3 and x = 1
So what we have are;
x + 3 and x -1
Multiplying both will give us the quadratic equation we are looking for.
(x + 3)(x-1) = x(x -1) + 3(x-1)
= x^2 -x + 3x -3 = x^2 + 2x -3
use the limit definition to find the slope of the tangent line to the graph of f at the given point. f(x) = 14 − x2, (3, 5)
Use the limit definition to find the slope of the tangent line to the graph of f at the given point. f(x) = 14 − x2, (3, 5)
The slope of the tangent line to the graph of f at (3, 5) is -6.
The slope of the tangent line to the graph of f at (3, 5) can be found using the limit definition of the slope. The slope of the tangent line can be calculated as the limit of the average rate of change of the function f(x) between two points as the distance between the points approaches zero. The formula is given by: lim _(h → 0) [f(x + h) - f(x)] / h
where h is the change in x, which is the difference between the x-value of the point in question and the x-value of another point on the tangent line. The given function is f(x) = 14 - x². To find the slope of the tangent line at x = 3, we need to calculate the limit of the average rate of change of f(x) as x approaches 3.
Using the formula,
lim_(h → 0) [f(x + h) - f(x)] / h
= lim_(h → 0) [(14 - (x + h)²) - (14 - x²)] / h
= lim_(h → 0) [14 - x² - 2xh - h² - 14 + x²] / h
= lim_(h → 0) [-2xh - h²] / h
= lim_(h → 0) [-h(2x + h)] / h
= lim_(h → 0) [-2x - h] = -2x
When x = 3, the slope of the tangent line is -2(3) = -6.
Therefore, the slope of the tangent line to the graph of f at (3, 5) is -6.
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Can you provide the solution for this exercise?
Let u(w) = −(b − w)c. What restrictions on w, b, and c are required to ensure that u(w) is strictly increasing and strictly concave? Show that under those restrictions, u(w) displays increasing absolute risk aversion.
under the restrictions that c is negative to ensure strict concavity, the utility function u(w) = -(b - w)c displays increasing absolute risk aversion.
To ensure that u(w) is strictly increasing, we need the derivative of u(w) with respect to w to be positive for all values of w. Taking the derivative, we have du(w)/dw = -c. For u(w) to be strictly increasing, -c must be positive, which implies c must be negative.
To ensure that u(w) is strictly concave, we need the second derivative of u(w) with respect to w to be negative for all values of w. Taking the second derivative, we have d²u(w)/dw² = 0. Since the second derivative is constant and negative, u(w) is strictly concave.
Now, let's examine the concept of increasing absolute risk aversion. If a utility function u(w) exhibits increasing absolute risk aversion, it means that as wealth (w) increases, the individual becomes more risk-averse.
In the given utility function u(w) = -(b - w)c, when c is negative (as required for strict concavity), the absolute risk aversion increases as wealth (w) increases. This is because the negative sign implies that the utility function is concave, indicating that the individual becomes more risk-averse as wealth increases.
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What is the correct percent for a quiz score of 25 points out of 36?
Answer:
the answer is 69%
it's just 25/36=0.6944444444.....
then multiply by a hundred= 69.44444444...=69%
hope this helps and feel free to give brainiest
Which of the following characteristics best describes the given function of ƒ(x) = -2x + 5 ?
the function is described as this
slope is 2intersect is 5Given data
The given function of ƒ(x) = -2x + 5
This is a linear equation and is compared with equation of straight line which is y = mx + c
where:
m is the slope of the equation
c is the intersect
comparing both equations
2x + 5 and mx + c
slope of the functionm = 2
intersect o the functionc = 5
Hence the characteristics of the function is fully described while comparing with linear equation. This shows that the slope is 2 and the intersect is 5
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The probability of the simultaneous occurrence of two events A and B is equal to the probability of A multiplied by the conditional probability of B giten that A has occurred (it is also equal to the probability of B multiplied by the conditional probability of A given that B has occurred).
When dealing with the simultaneous occurrence of two events A and B, the probability can be determined by using the probability of one event and the conditional probability of the other event given that the first event has occurred. Both P(A) * P(B|A) and P(B) * P(A|B) are valid ways to calculate this probability.
The concept of probability is fundamental in various fields such as mathematics, statistics, and even in everyday life. The probability of the simultaneous occurrence of two events A and B is a critical concept in probability theory. According to the definition, the probability of A and B occurring at the same time is equal to the probability of A multiplied by the conditional probability of B given that A has occurred. This equation is also valid in the reverse case, where the probability of B and A occurring simultaneously is equal to the probability of B multiplied by the conditional probability of A given that B has occurred.
Understanding the relationship between the probability of two events and their conditional probabilities is essential in predicting the likelihood of these events happening together. In real-life situations, this concept can be used to determine the probability of two events such as the success of a product launch and the corresponding increase in sales. The probability of these two events occurring simultaneously can be predicted by analyzing the probability of the product launch's success and the conditional probability of sales increasing given that the product launch is successful.
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if 20m2 square of carpet cost 36, find the cost of 35m square and 15m square
Answer: 63 and 27.
Step-by-step explanation:
1 m² of carpet will cost:
\(\displaystyle\\\frac{36}{20} =1,8.\\\\Hence,\\\)
35 m² of carpet will cost:
\(1,8*35=63.\\\)
15 m² of carpet will cost:
\(1,8*15=27.\)
Which ones apply?
Answers please
Solve the linear programming problem by the method of corners.
Maximize P = x + 6y
subject to: x + y ≤ 4
2x + y ≤ 7
x ≥ 0, y ≥ 0
The maximum is P =______________ at (x, y) = (_____________)
The maximum value of P is P=42 at (x,y)=(0,42).
Linear programming is a mathematical technique used to determine the best possible outcome from a given set of constraints. The method of corners is a technique used in linear programming to find the maximum or minimum value of a function by examining the corner points of the feasible region.
To solve the given linear programming problem using the method of corners, we first need to plot the two constraints on a graph. The feasible region is the shaded area bounded by the two lines x+y=42 and x+y=7. The next step is to identify the corner points of this feasible region.
The corner points of the feasible region can be found by solving the system of equations obtained by setting each of the two constraints equal to zero. Solving x+y=42 and x+y=7 simultaneously yields the corner points (0,42) and (7,0).
We can now evaluate the objective function P at each of the corner points to determine which point maximizes P. Substituting (0,42) and (7,0) into the objective function yields P=42 and P=7, respectively. Thus, the maximum value of P is 42, which occurs at the corner point (0,42).
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the probability that paul can solve the crossword puzzle in an hour is 0.4. the probability that annie can do that is 0.6. Find the probability that a)both of them can solve the puzzle in an hour; b) neither can solve the puzzle in an hour; c)only Mary can solve the puzzle in an hour; d)Mary or Burt can solve the puzzle in an hour;
The probabilities are given as follows:
a) Both: 0.24.
b) Neither: 0.24.
c) Only Mary: 0.36.
d) Mary or Burt: 0.76.
How to calculate a probability?The parameters that are needed to calculate a probability are listed as follows:
Number of desired outcomes in the context of a problem or experiment.Number of total outcomes in the context of a problem or experiment.Then the probability is then calculated as the division of the number of desired outcomes by the number of total outcomes.
For both people, we multiply the probabilities, hence:
0.6 x 0.4 = 0.24.
For neither people, we multiply the complement of the probabilities, hence:
(1 - 0.6) x (1 - 0.4) = 0.24.
For only Mary, we have that:
(1 - 0.4) x 0.6 = 0.36.
For at least one, we subtract the total of 1 from neither, hence:
1 - 0.24 = 0.76.
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what number sentence does this number line not illustrate
By applying the number line concept, it can be concluded that option D (4 - 3 - 5 = -4) is not illustrated by the number line.
Number line is a line that is used to represent numbers. Each point on the number axis corresponds to a number. The number axis is also known as the number axis.
When analyzing a number line, we can use the points on the number axis to determine the number sentence that it illustrates.
For example, if there are two points on the number axis that are labeled 2 and 5, the number sentence that the number line illustrates could be 2 + 3 = 5.
Option D (4 - 3 - 5 = -4) describes number 4 moving 3 steps to the left (-3) and then moving 5 more steps to the left (-5). However, the number axis illustrated number 4 moving 5 steps to the left (-5) and then moving 3 more steps to the left (-3).
Therefore option D is not illustrated by the number line.
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Find the full question attached.
2) what is a max and min number of ones in a k × k matrix representing total strict order? show your work.
The maximum and minimum number of ones in a k × k matrix representing total strict order is k.
To determine the maximum and minimum number of ones in a k × k matrix representing total strict order, we need to consider the structure of a total strict order matrix.
In a total strict order matrix, each row and each column must contain exactly one occurrence of the value 1, and all other entries must be zeros. Therefore, the maximum number of ones in a k × k matrix representing total strict order is k, as there can be one 1 in each row and each column.
Conversely, the minimum number of ones in a k × k matrix representing total strict order is also k. In order to achieve a total strict order, we need to have at least one 1 in each row and each column to satisfy the conditions. Therefore, the minimum number of ones is k.
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What is the radius of a hemisphere with a volume of
885
in
3
,
885 in
3
, to the nearest tenth of an inch?
The radius of the hemisphere is approximately 5.7 inches.
The volume of a hemisphere is given by the formula:
V = (2/3)πr³
V is the volume of the hemisphere and r is the radius.
We are given the volume of the hemisphere as 885 in³.
Solving for r we get:
r = \([(3V)/(2\pi)]^{(1/3)\)
Substituting V = 885 in³, we get:
r = \([(3 \times 885)/(2\pi)]^{(1/3)\)
≈ 5.7 inches (rounded to the nearest tenth)
The radius of the hemisphere is approximately 5.7 inches.
The formula: gives the volume of a hemisphere.
V = (2/3)πr³
r is the radius and V is the hemisphere's volume.
The hemisphere's size is specified as 885 in3.
When we solve for r we get:
r = \([(3V)/(2\pi)]^{(1/3)\)
With V = 885 in3 we obtain:
r = [(3 x 885)/(2π)](Rounded to the nearest tenth) (1/3) 5.7 inches
As a result the hemisphere's radius is around 5.7 inches.
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How do you change a table into a graph, and how do you know if it is additive or multiplicative graph?
Answer:
Click on insert, click graph, then make it to what u need
Step-by-step explanation:
hope this helps
Q1
1(a)
1(b)
Here is a list of numbers:
9,5, 1, 4, 8, 6, 2, 11, 4,3 =
Calculate the mean of the list of numbers.
53÷10=5.3
Calculate the range of the list of numbers.
(a) The mean of the list of numbers is 5.3
(b) The range of the list of numbers is 10
(a) How to calculate the mean of the list of numbers.From the question, we have the following parameters that can be used in our computation:
9,5, 1, 4, 8, 6, 2, 11, 4,3
The mean of the list of numbers is calculated as
Mean = sum/Count
using the above as a guide, we have the following:
Mean = (9 + 5 + 1 + 4 + 8 + 6 + 2 + 11 + 4 + 3)/10
So, we have
Mean = 5.3
(b) How to calculate the range of the list of numbers.The range of the list of numbers is calculated as
Range = Highest - Lowest
So, we have
Range = 11 - 1
Evaluate
Range = 10
Hence, the range is 10
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Find the area of the triangle whose vertices are given below. A(0,0) B(-6,5) C(5,3) ... The area of triangle ABC is square units. (Simplify your answer.)
The area of triangle ABC with
vertices A(0,0), B(-6,5), and C(5,3), is 21 square units.
To find the area of the triangle, we can use the formula for the area of a triangle formed by three points in a coordinate plane. Let's label the vertices as A(x₁, y₁), B(x₂, y₂), and C(x₃, y₃). The formula of the triangle formed by these vertices is:
Area = 1/2 * |x₁(y₂ - y₃) + x₂(y₃ - y₁) + x₃(y₁ - y₂)|
Plugging in the coordinates of the given vertices, we have:Area = 1/2 * |0(5 - 3) + (-6)(3 - 0) + 5(0 - 5)|
Simplifying further:
Area = 1/2 * |-18 + 0 - 25|
Area = 1/2 * |-43|
Since the absolute value of -43 is 43, the area of triangle ABC is:
Area = 1/2 * 43 = 21 square units.
Therefore, the area of triangle ABC is 21 square units.
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the lengths of songs on the radio are normally distributed with a mean length of 210 seconds. if 38.2% of all songs have lengths between 194 and 226 seconds, then the standard deviation of this distribution is
Answer:
Step-by-step explanation:
Write a recursive formula for the nth term of the sequence 5,12,19,26,....
Thus, beginning with a 1 = 5, the formula a n = a n-1 + 7 can be used to recursively find the nth term of the sequence.
what is sequence ?A sequence in mathematics is an ordered collection of numbers that is typically defined by a formula or rule. Every number in the series is referred to as a term, and its location within the sequence is referred to as its index. Depending on whether the list of terms stops or continues indefinitely, sequences can either be finite or infinite. By their patterns or uniformity, sequences can be categorised, and the study of sequences is crucial to many areas of mathematics, such as calculus, number theory, and combinatorics. Mathematical, geometrical, and Fibonacci sequences are a few examples of popular sequence types.
given
The sequence's terms are all different by 7 (i.e., 12 - 5 = 19 - 12 = 26 - 19 =... = 7).
The following is a definition of a recursive formula for the nth element of the sequence:
a 1 = 5 (the first term of the series is 5) (the first term of the sequence is 5)
For n > 1, each term is derived by adding 7 to the preceding term, so a n = a n-1 + 7.
Thus, beginning with a 1 = 5, the formula a n = a n-1 + 7 can be used to recursively find the nth term of the sequence. For instance, we have
a_2 = a_1 + 7 = 5 + 7 = 12
a_3 = a_2 + 7 = 12 + 7 = 19
a_4 = a_3 + 7 = 19 + 7 = 26
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if the series 3 3z 6z^2 9z^3 is geometric, give the initial term, and the ratio between successive terms
The series is not geometric.
What is geometric series?
In mathematics, the geometric series means the sum of the terms that have a common ratio between every adjacent two terms of them. There can be two types of geometric series: finite and infinite.
The given series is
3 , 3z, 6z², 9z³
The given series is either geometric or not.
The initial term or the first term is 3 which also can be written as 3z⁰
Ratio between successive terms can be determined by
second term/ first term
Here second term is 3z and first term is 3
So the ratio is 3z/3
= z
If the series is geometric then
it must be equal to 6z²/ 3z= 2z and 9z³/ 6z² = (3/2)z
The ratios are not equal to each other.
Hence, the series is not geometric.
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find the taylor polynomial t3(x) for the function f centered at the number a. f(x) = xe−4x, a = 0
To find the Taylor polynomial t3(x) for the function f(x) = xe^(-4x) centered at a = 0, we need to find the first four derivatives of f(x) at x = 0, evaluate them at x = 0, and use them to construct the polynomial.
The first four derivatives of f(x) are:
f'(x) = e^(-4x) - 4xe^(-4x)
f''(x) = 16xe^(-4x) - 8e^(-4x)
f'''(x) = -64xe^(-4x) + 48e^(-4x)
f''''(x) = 256xe^(-4x) - 256e^(-4x)
Evaluating these derivatives at x = 0, we get:
f(0) = 0
f'(0) = 1
f''(0) = -8
f'''(0) = 48
f''''(0) = -256
Using these values, we can construct the third-degree Taylor polynomial t3(x) for f(x) centered at x = 0:
t3(x) = f(0) + f'(0)x + f''(0)x^2/2! + f'''(0)x^3/3!
t3(x) = 0 + 1x - 8x^2/2 + 48x^3/3!
t3(x) = x - 4x^2 + 16x^3/3
Therefore, the third-degree Taylor polynomial for the function f(x) = xe^(-4x) centered at a = 0 is t3(x) = x - 4x^2 + 16x^3/3.
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(-55 +94i) + (13 – 12i) =
Express your answer in the form (a + bi).
Answer:
(−55+94i) + (13−12i) = (−42+82i)
Step-by-step explanation:
The sum of the two complex numbers, (a+bi) and (c+di), is ((a+c) + (b+d)i)
( - 55 + 94i) + ( 13 - 12i) =
( - 42 + 82i)