an airplane takes 3 hours to travel a distance of 1440 miles with the wind. The return trip takes 4 hours against the wind. Find the speed of the plane in the still air and the speed of the wind.
Answer:
The speed of the plane in the still air is 420 miles/hour
The speed of the wind 60 miles/hour
Step-by-step explanation:
Let the speed of the plane with the wind be v
Let the speed of the plane against the wind be u
Now, speed = distance/time
With the wind,
v = (1440 miles)/(3 hours) = 480 miles/hour
v = 480 miles/hour
Against the wind,
u = (1440 miles)/(4 hours) = 360 miles/hour
u = 360 miles/hour
Now, let the speed of plane be p, and speed of wind be w,
Now, with the wind, the speed is 480 mph,
so,
speed of plane + speed of wind = 480 mph
p + w = 480 (i)
and against the wind, the speed is 360 mph,
so,
speed of plane - speed of wind = 360mph
p-w = 360 (ii)
adding equations (i) and (ii), we get,
p+w + p-w = 480 + 360
2p = 840
p = 840/2
p = 420 miles/hour
Then, the speed of the wind will be,
p + w = 480,
420 + w = 480
w = 480 - 420
w = 60 miles/hour
The speed of the plane in still air is calculated to be 420 mph, and the speed of the wind is calculated to be 60 mph by solving the two simultaneous equations obtained from the time, rate, and distance relationship.
Explanation:This problem is about the rate, time, and distance relationships. The rate at which the airplane travels in still air is r (unaffected by wind), and the speed of the wind is w. When the plane flies with the wind, it is 'assisted' and therefore travels faster - at a speed of (r + w); against the wind, it travels slower - at a speed of (r - w).
From the problem, we know that:
The trip with the wind covers 1440 miles in 3 hours, so (r + w) * 3 = 1440The return trip against the wind covers the same 1440 miles in 4 hours, so (r - w) * 4 = 1440By solving these two equations, we get the following:
r + w = 480r - w = 360Adding these two gives 2r = 840 => r = 420 mph (the speed of the plane in still air), and subtracting gives 2w = 120 => w = 60 mph (the speed of the wind).
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The graph of part of linear function h is shown on the grid. Which inequality best represents the domain of the part shown?
The domain of the given function would be -
- 5 ≤ x < 3.
What is a function?
An function in mathematics defines a relationship between one variable (the independent variable {x}) and another variable (the dependent variable {y}). Example → y = f{x} = ax + b.
Given is the graph of the linear equation as shown in the image.
Domain represents the set of values along the {x} - axis.
So, we can write -
- 5 ≤ x < 3
Therefore, the domain of the given function would be -
- 5 ≤ x < 3.
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How many real and complex roots exist for the polynomial
F(x)= x³ +2x² + 4x+8 ?
OA. 2 real roots and 1 complex root
OB. 1 real root and 2 complex roots
C. 3 real roots and 0 complex roots
D. 0 real roots and 3 complex roots
The roots of the function F(x) = x³ + 2x² + 4x + 8 are given as follows:
B. 1 real root and 2 complex roots.
How to identify the zeros of the function?The function in this problem is defined as follows:
F(x) = x³ + 2x² + 4x + 8.
The function is of the third degree, hence the total number of zeros of the function is of 3.
From the graph, the function has only one x-intercept, which is given as follows:
x = -2.
Hence the two remaining roots are the complex roots, meaning that option B is the correct option for this problem.
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What are the steps to solving the inequality g+2/-3<-2
Answer:
g< -4/3
Step-by-step explanation:
Add 2/3 to both sides.
g+2/-3 + 2/3 <-2 + 2/3
g< -4/3
One step equation
-104=8x
Answer:
The answer you gave can only be solved if you know what the Variable is.
Step-by-step explanation:
A one-step equation is an algebraic equation you can solve in only one step. Once you've solved it, you've found the value of the variable that makes the equation true. To solve one-step equations, we do the inverse (opposite) of whatever operation is being performed on the variable, so we get the variable by itself.
What is the slope-intercept form of this equation? Show all your work. 6x + 2y = 12
from converting the linear equation 6x - 2y = 12 and slope intercept form we have to transpose terms to get the value of y hence equation and slope intercept form is y = 3x - 6.
Write a number that has a digit that is 10 times the 2 in 7.32_.
Answer: 7.2
The 2 in the number 7.32 is in the tenths place.
We must move it to the hundredths place, 1 step forward.
You get a number of 7.2. The answer can be 7.2.
Hope this helps!
A quadrilateral is shown.
H
6.5
5.51
What is the area of the quadrilateral? Enter the answer in the box.
The calculated area of the quadrilateral is 35.82 square units.
What is the area of the quadrilateral?Given that
BAse = 6.5
Height = 5.51
To find the area of a quadrilateral, we need to multiply the base by the height.
Area of quadrilateral = base x height
Substituting the given values, we get:
Area = 6.5 x 5.51
Area = 35.815
Rounding to the nearest hundredth, the area of the quadrilateral is 35.82 square units.
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what is 1234 times 123456789? please answer fast!!!
Answer:
123,458,023 is the answer
Step-by-step explanation:
Answer:
152,345,677,626
Step-by-step explanation:
Which of the following expressions is equivalent to log 5 - k log 2?
Select one answer
Answer:
C
Step-by-step explanation:
log5- klog2= log5-log2^k = log(5/2^k)
Angle sun theorum solve for Y
Answer:
Angle sum Theorem says that the sum of the measures of the interior angles of a triangle is 180 degrees. ... This creates alternate interior angles that are congruent. Sum of two interior angles equals the opposite exterior angle...33 + 87 = yy = 120°
Step-by-step explanation:
3. 5p - 14 = 8p + 4
Read the poem excerpt. A backyard reality is rearranged. Hopscotch lines cower and hide, The toys in the yard . . . lost until spring. Which statement best describes the meter? The meter is free, reflecting a two-way conversation. The meter is free, making the poem unpredictable. The meter is fixed, and every syllable is stressed. The meter is fixed, drawing attention to the end rhyme.
Answer:
B
Step-by-step explanation:
Answer:
b fasho
Step-by-step explanation:
Question 22 of 25Which list is ordered from least to greatest?L) 52.932M) 583.31N) 52.930) 8.39P) 89.223A. N, L, M, P, OOB. M, P, L, N, OOC. O, N, L, P, MOD. P. O, L, M, N
Solution
- The ordered list from the least to the greatest is:
\(8.39,52.93,52.932,89.223,583.31\)- Thus, using the arrangement of the numbers, we can rearrange using the letters.
O, N, L, P, M
Final Answer
O, N, L, P, M (OPTION C)
PLEASE HELP !!!!!!!!!!
Answer:
154°
Step-by-step explanation:
EAB must equal 180°, so if you subtract 26 from that you get 154
Answer:154 !
Step-by-step explanation:
the answer would be 154
please help me with this will give brainliest to best answer
Answer:
this may sound crazy but its A,B,C,D
Step-by-step explanation:
they not in the boundaries 0f 5 to 0 or -2 to 0
What is the value for x,the length of side bc?7 to
Answer:
x = 17.5
Step-by-step explanation:
\( \triangle ABC \sim \triangle DEF... (given)\)
\( \therefore \frac{AB}{DE} = \frac{BC}{EF} \)
\( \therefore \frac{10}{4} = \frac{x}{7} \)
\( \therefore 2.5 = \frac{x}{7} \)
\( \therefore 2.5\times 7= x\)
\( \therefore 17.5= x\)
\( \therefore x = 17.5\)
Compare the algebraically expressed function f(x) = 1 4 x2 - 2x to the function shown in the graph to determine which statement is true. A) The algebraic function has a greater maximum value. B) The algebraic function has a lower minimum value. C) The graphed function has a greater maximum value. D) The graphed function has a lower minimum value.
The correct statement regarding the minimum value of the quadratic functions is given as follows:
D) The graphed function has a lower minimum value.
How to obtain the minimum value of the quadratic functions?From the graph, the minimum value of the quadratic function is given as follows:
y = -8.
The algebraic function is defined as follows:
f(x) = 0.25x² - 2x.
Hence the coefficients are given as follows:
a = 0.25 and b = -2.
The x-coordinate of the vertex is given as follows:
x = -b/2a
x = 2/0.5
x = 4.
Then the y-coordinate of the vertex, representing the minimum value, is given as follows:
f(4) = 0.25(4)² - 2(4)
f(4) = -4 -> meaning that the graphed function has a lower minimum value.
Missing InformationThe graph is given by the image presented at the end of the answer.
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Write an equation for each line?
Fernando picks a marble at random. without putting the first marble back he picks second marble at random are thertwo events dependent or independent
Given the word problem, we can deduce the following information:
1. Fernando picks a marble at random.
2. Without putting the first marble back, he picks a second marble at random.
To determine if the events are dependent or independent, we first note that dependent events influence the probability of other events, while independent events do not affect one another.
Since Fernando picks a marble without putting the first marble back, the probability of the second pick is affected.
Therefore, the answer is dependent.
Find the slope of the line passing through the points (-4,8) and (-8,5)
Answer:
\( \frac{3}{4} \)
Step-by-step explanation:
Slope formula:
\(\boxed{ slope = \frac{y _{1} - y_2 }{x_1 - x_2} }\)
where (x₁, y₁) is the first coordinate and (x₂, y₂) is the second coordinate
Slope
\( = \frac{8 - 5}{ - 4 - ( - 8)} \)
\( = \frac{3}{ - 4 + 8} \)
\( = \frac{3}{4} \)
Which of the following is the solution to the differential equation dy/dx=2xy/x^2+1 whose graph contains the points (0,1)?
A. y=ex^2
B. y=x^2+1
C. y=ln(x^2+1)
D. y=1+ln(x^2+1)
E. y=sqrt(1+2ln(x^2+1))
Answer:
B. y = x² + 1
General Formulas and Concepts:
Symbols
e (Euler's number) ≈ 2.7182Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightEquality Properties
Multiplication Property of Equality Division Property of Equality Addition Property of Equality Subtraction Property of EqualityAlgebra I
FunctionsAlgebra II
Logarithms - ln and eCalculus
Derivatives
Derivative Notation
Derivative of a constant is 0
Basic Power Rule:
f(x) = cxⁿ f’(x) = c·nxⁿ⁻¹Slope Fields
Solving Differentials - Integrals
Integration Constant C
U-Substitution
ln Integration: \(\displaystyle \int {\frac{1}{x}} \, dx = ln|x| + C\)
Step-by-step explanation:
*Note:
When solving differential equations in slope fields, disregard the integration constant C for variable y.
Step 1: Define
\(\displaystyle \frac{dy}{dx} = \frac{2xy}{x^2 + 1}\)
Point (0, 1)
Step 2: Rewrite Differential
Rewrite Leibniz Notation using Separation of Variables.
[Separation of Variables] Isolate x's together: \(\displaystyle dy = \frac{2xy}{x^2 + 1}dx\)[Separation of Variables] Isolate y's together: \(\displaystyle \frac{1}{y}dy = \frac{2x}{x^2 + 1}dx\)Step 3: Integrate Pt. 1
Solving general form of differential using integration.
[Differential] Integrate both sides: \(\displaystyle \int {\frac{1}{y}} \, dy = \int {\frac{2x}{x^2 + 1}} \, dx\)[Left Integral] ln Integration: \(\displaystyle ln|y| = \int {\frac{2x}{x^2 + 1}} \, dx\)Step 4: Identify Variables
Set up u-substitution for right integral.
u = x² + 1
du = 2xdx
Step 5: Integrate Pt. 2
[Right Integral] U-Substitution: \(\displaystyle ln|y| = \int {\frac{1}{u}} \, du\)[Right Integral] ln Integration: \(\displaystyle ln|y| = ln|u| + C\)Back-Substitute: \(\displaystyle ln|y| = ln|x^2 + 1| + C\)[Equality Property] Raise e on both sides: \(\displaystyle e^{ln|y|} = e^{ln|x^2 + 1| + C}\)Simplify: \(\displaystyle |y| = C|x^2 + 1|\)General Form: \(\displaystyle |y| = C|x^2 + 1|\)
Step 6: Solve Particular Solution
Since both sides have absolute value, assume that the particular solution will be positive.
Substitute in point [General Form]: \(\displaystyle |1| = C|(0)^2 + 1|\)[Particular] |Absolute Value| Evaluate exponents: \(\displaystyle |1| = C|1|\)[Particular] Evaluate absolute values: \(\displaystyle 1 = C\)[Particular] Rewrite: \(\displaystyle C = 1\)Substituting integration constant C into the general form:
Particular Solution: \(\displaystyle y = x^2 + 1\)
Topic: AP Calculus AB/BC (Calculus I/II)
Unit: Differentials and Slope Fields
Book: College Calculus 10e
Select the correct answer.
Rewrite the following equation as a function of x.
Answer:
It's D
Step-by-step explanation:
Answer: The correct answer is D
Step-by-step explanation:
The diagram shows a field.
66 m
140m
102 m
Work out the area of the field.
4
Answer:
The area of the field will be 60504 Sq. m
Step by Step calculation:
Area of the cuboidal field
A cuboid is a three-dimensional figure bounded by six rectangular planes that have different lengths, widths, and heights. If you look around and see a box, brick, or anything in the shape of a rectangle, it might be a cuboid. A cuboid (\(3\)-dimensional) can be seen as composed of rectangles (\(2\)-dimensional) of different dimensions when viewed from either end
Total area of block = lh + lh + lb+ lb+ hb+ hb=\(2\)(lb+bh+hl).......(1)
where l means length h means height and b means the breadth of the cuboid
Put the value of length, breadth, and height in (1)
We get TSA of field as= 2(66*140+140*102+102*66 ) = 60504 m^2
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What is the slope of a line that is perpendicular to the line 2y – 3x = 8?
Answer:
\( = \frac{3}{2} \)
Step-by-step explanation:
\(y = mx + c\)
Here,
m => slopec => interceptIn this equation ,
\(2y - 3x = 8\)
to find the value of m or the value of slope we have to solve for y
Let's solve,
\(2y - 3x = 8 \\ 2y = 8 + 3x \\ \frac{2y}{2} = \frac{8 + 3x}{2} \\ y = 4 + \frac{3x}{2} \\ y = \frac{3x}{2} + 4\)
So, the slope is,
\( = \frac{3}{2}\)
James wants to have earned $6,180 amount of interest in 28 years. Currently he finds
that his annual interest rate is 6.12%. Calculate how much money James needs to invest
as his principal in order to achieve this goal.
Answer:
$3606.44
Step-by-step explanation:
The question asks us to calculate the principal amount that needs to be invested in order to earn an interest of $6180 in 28 years at an annual interest rate of 6.12%.
To do this, we need to use the formula for simple interest:
\(\boxed{I = \frac{P \times R \times T}{100}}\),
where:
I = interest earned
P = principal invested
R = annual interest rate
T = time
By substituting the known values into the formula above and then solving for P, we can calculate the amount that James needs to invest:
\(6180 = \frac{P \times 6.12 \times 28}{100}\)
⇒ \(6180 \times 100 = P \times 171.36\) [Multiplying both sides by 100]
⇒ \(P = \frac{6180 \times 100}{171.36}\) [Dividing both sides of the equation by 171.36]
⇒ \(P = \bf 3606.44\)
Therefore, James needs to invest $3606.44.
The password to sally cell phone has to be four digits and she can use the numbers 0-9 she is allowed to repeat the same number multiple times. Which option shows how to calculate the total number of passwords sally could create
if there is 4 digits and 9 numbers each there is a possibility of 9 to the power of 4 different combinations.
1. A taxi cab costs $4.50 for the first mile and $0.75 for each additional mile. Write & solve an equation that could be solved to find how many miles you can travel in a taxi for $30, given that m is the number of additional miles?
Equation: 0.75 divided by 30
Solution:_______________________
PLEASE ANSWER THE WHOLE QUESTION!
Answer:
55x-5=78
Step-by-step explanation:
log(2x) = 2
The value of x is?
Answer:
\(x=50\)
Step-by-step explanation:
\(log(2x)=2\\\\10^{log(2x)}=10^2\\\\2x=100\\\\\frac{2x}{2}=\frac{100}{2}\\ \\ x=50\)
(8m-3n)(5m+9n) simplify
Answer:
40m² + 57mn - 27n²
Step-by-step explanation:
(8m - 3n)(5m + 9n)
each term in the second factor is multiplied by each term in the first factor, that is
8m(5m + 9n) - 3n(5m + 9n) ← distribute both parenthesis
= 40m² + 72mn - 15mn - 27n² ← collect like terms
= 40m² + 57mn - 27n²