an alloy contains 26% of copper. what quantity of alloy is required to get 260 of copper?
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Related Questions
can someone help me
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The answer is f(-2) = 30
The question requires us to substitute the value of x into the function.
if the function is:
\(f(x)=-2x^3+2x^2-2x+2\)then f(-2) means we only need to substitute -2 for x into the equation given.
\(\begin{gathered} f(-2)=-2(-2)^3+2(-2)^2-2(-2)+2 \\ (-2)^3=-8_{} \\ (-2)^2=4 \\ -2(-2)=4 \\ \\ f\mleft(-2\mright)=-2\mleft(-8\mright)+2\mleft(4\mright)+4+2 \\ f(-2)=16+8+4+2 \\ f(-2)=30 \end{gathered}\)Therefore,
The final answer is f(-2) = 30
Please help!!!!
\((\pi \sqrt 81 \frac{\sqrt[3]{8}}{2} ) / 3\pi = ???\)
Answers
Step-by-step explanation:
\((9\pi \frac{2}{2} )\div 3\pi \\ \)
\( \frac{9\pi}{3\pi} \\ \)
\(3\pi\)
3π is the answer
Presbycusis is the gradual hearing loss that occurs as a person ages. An estimated one-quarter of Americans between the ages of 65 and 75 and three-quarters of those older than 75 have some degree of hearing loss.
An audiologist is interested in the efficacy of three different types of hearing aids. He gathers three groups of hearing-impaired clients: One group receives analog hearing aids, which convert sound waves into amplified electrical signals. The second group receives digital hearing aids, which use directional microphones to control the flow of sound and convert the sound waves into numerical codes before amplifying them. The third group receives cochlear implants. The results come in, and a statistician conducts an analysis of variance.
The _____________ is that there is no difference between the population means (in other words, there is no treatment effect).
The ____________ is that at least one of the population means is different from another (in other words, there is an effect of at least one of the treatments).
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Answer:
The answer is the "Null hypothesis and Alternative hypothesis".
Step-by-step explanation:
The null hypothesis is almost like a hypothesis test, which indicates the certain demographic characteristics which aren't varied.
The alternative presumption will be that the hypothesis besides making predictions is opposite to the void assumption. Its posts are generally taken as a result of a meaningful effect.
Difference:
The null hypothesis is indeed a gross generalization, which specifies there is no relation between different phenomenons under evaluation. There is no association between the two groups. An alternate solution hypothesis is a statement, that defines there is a relation between different chosen variables in this study.
What is the value of the discriminant for the quadratic equation –3 = –x2 + 2x?
Discriminant = b2 – 4ac
–8
4
8
16
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The value of the discriminant for the quadratic equation –3 = –x2 + 2x is 16
What is the value of the discriminant for the quadratic equation?The quadratic equation is given as:
–3 = –x^2 + 2x
Rewrite the equation as:
x^2 - 2x - 3 = 0
A quadratic equation is represented as;
ax^2 + bx + c = 0
So, we have
a = 1
b = -2
c = -3
The discriminant is
d = b^2 - 4ac
So, we have
d = (-2)^2 - 4 * 1 * -3
Evaluate
d = 16
Hence, the value of the discriminant for the quadratic equation –3 = –x2 + 2x is 16
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Answer:
16
Step-by-step explanation:
write the fraction in vertical form.
3/5
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Answer:
Its 3/5 cause you cant do vertical
Step-by-step explanation:
(CO 4) In a sample of 15 stuffed animals, you find that they weigh an average of 8.56 ounces with a standard deviation of 0.09 ounces. Find the 92% confidence interval.
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Answer:
92% Confidence Interval = [8.515, 8.605]
Step-by-step explanation:
The number of samples given is 15,this less than 30, hence, we use the t score confidence Interval
= Mean ± t score × Standard deviation/√n
Mean = 8.56 ounces
Standard deviation = 0.09 ounces
n = 15
We find the degrees of freedom = n - 1
= 15 - 1 = 14
Using the T score table
T score for 92% confidence interval with degrees of freedom 14
= 1.8875
Hence:
Confidence Interval =
= 8.56 ± 1.8875 × 0.09/√15
= 8.56 ± 0.0454010035
Confidence Interval
8.56 - 0.0454010035
= 8.5145989965
≈ 8.515
8.56 + 0.0454010035
= 8.6054010035
≈ 8.605
92% Confidence Interval = [8.515, 8.605]
find the perimeter of the composite figure. 11 19.5 16 m 18m
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The perimeter of the composite figure that is given above would be = 96.6m.
How to calculate the perimeter of the given figure?To calculate the perimeter of the given shape, it has to be divided into two.
First shape is a rectangle. Therefore the perimeter of a rectangle is calculated with the formula = 2(l+w)
Where ;
length = 16m
width = 11m
perimeter = 2(16+11)
= 2×27
= 54m
The second shape:
Perimeter of triangle = l+w+h
where;
length = 18-11 = 7m
width = 16m
height = 19.5m
perimeter = 7+16+19.5 = 42.5m
Therefore, the perimeter of the shape = 54+42.5 = 96.6m
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which diagram below appears to show a pair of perpendicular lines Diagram A Diagram B Diagram C. Explain your Answer.
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The answer for it is diagram B because it does not cross or have parallel lines
-5 1/4 -(-7 1/2) simplify
really fast pleas
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The hanger image below represents a balanced equation.
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Answer:
\( \frac{1}{5} + z = \frac{3}{5} \)
Answer:
1/5+z=3/5
Step-by-step explanation:
What are the slope and y-intercept of the graph of the given equation?
y = –4x + 2
a. The slope is 2 and the y-intercept is –4.
b. The slope is 4 and the y-intercept is –2.
c. The slope is –2 and the y-intercept is –4.
d. The slope is –4 and the y-intercept is 2.
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Answer:
the answer is D The slope is -4 and the y-intercept is 2
Step-by-step explanation:
the equation use is y=mx+b slope repusents M and the y-intercept repusents B hope this helps you out
-4-5(2x -4) = 76
-6
9
-4
7
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9514 1404 393
Answer:
x = -6
Step-by-step explanation:
-4 -10x +20 = 76 . . . . . eliminate parentheses
-10x = 60 . . . . . . . . . . . subtract 16
x = -6 . . . . . . . . . . . . . . divide by -10
commutative property of (32)-5+7?
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Answer:
= 34
Step-by-step explanation:
(32)-5+7
32 - 5 + 7
= 32 + 2
= 34.
Compute and express each value in scientific notation. (please show work)
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Answer:
(9 × 10⁴) (1.6 × 10³) / (2 × 10⁵) ( 3 × 10⁴) (1.2 × 10⁴)
Solve the equation using Gauss Naïve method, a) 3x1 − 2x2 + x3 = −10, 2x1 + 6x2 − 4x3 = −10, −8x1 − 2x2 + 5x3 = −26
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Answer:
Step-by-step explanation:
Given the system of equation
3x1 − 2x2 + x3 = −10 ............. 1
2x1 + 6x2 − 4x3 = −10 ............ 2
−8x1 − 2x2 + 5x3 = −26 ............... 3
Reduce the system of equations:
multiply equation 1 by 3 and add to 2
Eqn 1 * 3 gives;
9x1 − 6x2 + 3x3 = −30
Add to equation 2:
9x1+2x1 +(3x3-4x3) = -30-10
11x1 - x3 = -40 ........... 4
multiply eqn 3 by 3 and add to eqn 2
eqn 3 * 3 gives
−24x1 − 6x2 + 15x3 = − 78
Add to eqn 2:
-24x1+2x1)+15x3-4x3 = -78-10
-22x1 + 11x3 = -88 ......... 5
solve 4 and 5:
11x1 - x3 = -40 ........... 4 * 2
-22x1 + 11x3 = -88 ......... 5 * 1
.....................................................
22x1 - 2x3 = -80
-22x1 + 11x3 = -88
Add together:
-2x3 + 11x3 = -80-88
9x3 = -168
x3 = -168/9
x3 = 18.7
subtitute x3 = 18.7 into 4
11x1 - 18.7 = -40
11x1 = -40+18.7
11x1 = -21.3
x1 = -21.3/11
x1 = -1.93
Substitute x1 and x3 into 1
3(-1.93)− 2x2 + 18.7 = −10
- 5.79-2x2 = -28.7
-2x2 = -18.7 +5.79
-2x2 = -22.91
x2 = 11.455
Which ratio has a unit rate of 4 choose all that apply
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Answer:
Where are the answer choices my dude
Step-by-step explanation:
The Empirical Rule states that for bell-shaped distributions, about 68% of the values fall within 1 standard deviation of the mean. The heights of women at a large university are approximately bell-shaped, with a mean of 66 inches and standard deviation of 3 inches. Use this information to answer the questions. (a) What is the probability that a randomly selected woman from this university is 69 inches or taller
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Answer: 0.16
Step-by-step explanation:
Let X be a random variable that represents the heights of women at a large university are approximately bell-shaped, with a mean of 66 inches and standard deviation of 3 inches.
According to the Empirical Rule, for bell-shaped distributions, about 68% of the values fall within 1 standard deviation of the mean.
About 68% woman have height between ( 66-3) inches and (66+3) inches.
i.e. About 68% woman have height between 63 inches and 69 inches.
The percentage of woman have height either less than 69 inches or greater than 69 inches =100% - 68%= 32% [both share equal area on curve.]
The percentage of woman have height is 69 inches or taller = 32%÷2
= 16%
Hence, the probability that a randomly selected woman from this university is 69 inches or taller =16%=0.16
can i get factors of 256
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Step-by-step explanation:
Factors of 256: 1, 2, 4, 8, 16, 32, 64, 128 and 256.
Hope it will help :)❤
Here the answer hope this helps:
factors of 256 are.... 1, 2, 4, 8, 16, 32, 64, 128 and 256.
Step-by-step explanation:
hope this helps
Ciana earns an hourly wage of $30 at her job. In order to purchase her sneakers she will have to take time off work, so each hour away from her job
costs her $30 in lost Income. Assume that ciana travel time is the same each way (to and from the store) and that it will take her 30 minutes once
she reaches a store to complete her shopping. Assume throughout the question that ciara incurs no additional costs other than the sneakers, such as
gas.
complete the following table by computing the opportunity cost of ciana’s time and the total cost of shopping at each location
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Ciana should purchase the skirt at the store across town because the total economic cost will be lowest.
How to determine the opportunity cost?Ciana makes $30 per hour at her work, and her purchase decision includes the opportunity cost of lost wages:
Total economic cost:
Local store = $114 + [1/4 hours x 2 (round trip) x $30] + (1/2 hours x $30 spent shopping) = $144
Across town = $86 + [1/2 hours x 2 (round trip) x $30] + (1/2 hours x $30 spent shopping) = $131
Neighboring city = $60 + [1 hour x 2 (round trip) x $30] + (1/2 hours x $30 spent shopping) = $135
Ciana should buy a skirt at the store across town. Because it has the lowest total economic cost ($131).
Opportunity cost is the lost benefit or additional cost of choosing one activity or investment over another. Economic costs include both accounting costs and opportunity costs.
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a light flashes every 8 seconds how many times will it flash in 3 minutes
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What is the slope and y-intercept of the equation: y = -2/3x + 5
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Answer:
-2/3 is slope and y-intercept is 5
You are buying a used car which costs $10,200. You plan to sell the car after keeping it for 5 years. Research shows that this car will lose value at a rate of 8% per year. How much will the car be worth after 5 years?
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Answer:
$6,722.63
Step-by-step explanation:
Now: $10,200
In 1 year: 0.92 × $10,200 = $9,384
In 2 years: 0.92 × $9,384 = $8,633.28
In 3 years: 0.92 × $8,633.28 = $7,942.6176
In 4 years: 0.92 × $7,942.6176 = $7,307.208192
In 5 years: 0.92 × $7,307.208192 = $6,722.63
Answer: $6,722.63
Answer:
$6,722.63
Step-by-step explanation:
Using this formula A=P(1-d/100)^n where
A = Amount
P = Principal
d = percent
n = number of year
A=P(1-d/100)^n
A = 10,200(1-8/100)⁵
A = 10,200(1-0.08)⁵
A = 10,200(0.92)⁵
A = 10,200(0.6591)
A= $6,722.63
A shampoo company conducted a survey and found that 3 out of 8 people use their brand of shampoo. Which proportion could be used to
find the expected number of users n in a city of 75,000 people?
75.000
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Answer:yes
Step-by-step explanation:yes
Answer:
3/8 = x/75,000
Step-by-step explanation:
We are looking for x, the number of people in a city of 75,000 that use the shampoo.
3 is to 8 as x is to 75,000
3/8 = x/75,000
Please help me someone
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Answer:
6/8
Step-by-step explanation:
1/8+1/4+3/8
1/8+2/8+3/8
The variables y and x have a proportional relationship, and y = 12 when x = 5.
What is the value of y when x = 8?
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Y= 19.2
Answer:
y = 19.2
Step-by-step explanation:
We know there is relationship between y and x, so according to the formula \(y = kx\)
k = 12/5
we get one function y = 2.4x
when x = 8, input it into the function,
y = 2.4×8 = 19.2
Which of the following is a prime number between 1 and 10? A. 9 B. 8 C. 7 D. 6
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Answer: 7
Step-by-step explanation:
Find the area of the shape below list the area of each part of the total area.
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Step 1
Shape A is parallelogram
Shape B is Trapezium
We are going to find the area of each shapes and sum them to have the total area.
Step 2
\(\begin{gathered} \text{Area of shape A =bh} \\ where\text{ b is the base } \\ \text{and h is the height} \\ b=5 \\ h=3 \\ \text{Area of shape A =5}\times3 \\ \text{Area of shape A =}15 \end{gathered}\)Step 3
To find the area of shape B
we need to know the distance between the points
\(\begin{gathered} \text{Distance betwe}en\text{ BC} \\ D=\sqrt[]{(x_2-x_1)^2+(y_2-y_{1)^2}} \\ p\text{ oint B (2,-4)} \\ p\text{ oint }C\text{ (5,-3)} \\ D=\sqrt[]{(5_{}-2_{})^2+(-3_{}-(-4)^2} \\ \\ D=\sqrt[]{3^2+1^2} \\ D=\sqrt[]{9+1} \\ D=\sqrt[]{10} \\ D=3.1622776601684 \\ \therefore BC\text{ =3.16} \end{gathered}\)\(\begin{gathered} \text{Distance betwe}en\text{ DC} \\ D=\sqrt[]{(x_2-x_1)^2+(y_2-y_{1)^2}} \\ P\text{ oint D (4,0)} \\ P\text{ oint C (5,-3)} \\ D=\sqrt[]{(5_{}-4_{})^2+(-3_{}-0)^2} \\ \\ D=\sqrt[]{1^2+(-3_{})^2} \\ D=\sqrt[]{1+9} \\ D=\sqrt[]{10} \\ DC=\sqrt[]{10} \end{gathered}\)\(\begin{gathered} \text{Distance betw}eent\text{ AD} \\ D=\sqrt[]{(x_2-x_1)^2+(y_2-y_{1^{}}})^2 \\ p\text{ oint A(-5,-3)} \\ p\text{ oint D (4,0)} \\ D=\sqrt[]{(4_{}-(-5)_{})^2+(0_{}-(-3)})^2 \\ D=\sqrt[]{(9_{})^2+(-3})^2 \\ D=\sqrt[]{81+9} \\ D=\sqrt[]{90} \\ AD=\sqrt[]{90} \\ AD=3\sqrt[]{10} \end{gathered}\)Now
We can find now find the area of shape B
\(\begin{gathered} \text{Area of shape B (Trapeziod)=}\frac{a+b}{2}h \\ \text{where a=}\sqrt[]{10} \\ b=3\sqrt[]{10} \\ h=\sqrt[]{10} \\ \text{Area of shape B (Trapeziod)=}\frac{\sqrt[]{10}+3\sqrt[]{10}}{2}\times\sqrt[]{10} \\ \\ \text{Area of shape B (Trapeziod)=}\frac{4\sqrt[]{1}0}{2}\times\sqrt[]{10} \\ \\ \text{Area of shape B (Trapeziod)}=20 \end{gathered}\)Finally
We add area of shape A and Shape B
Area of shape A=15
Area of shape B=20
The total area of the shape =35 square units
\(\text{The total area = 35}\)1
Solve the inequality. Then graph the solution on a number line.
2y + 4 > 2(3 + y)
Answers
The solution to the inequality is 2 > 3 and the graph does not exist
How to determine the graphFrom the question, we have the following parameters that can be used in our computation:
2y + 4 > 2(3 + y)
Divide through by 2
y + 2 > 3 + y
Evaluate the like terms
2 > 3
The above expression is an inequality that implies that
The value of 2 exceeds 3
This statement is false and the graph does not exist
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The inequality has no solutions, thus, its graph is a number line alone.
How to solve the inequality?Here we want to solve the inequality below:
2y + 4 > 2*(3 + y)
To do so, we need to isolate the variable y.
2y + 4 > 2*(3 +y)
2y + 4 > 6 + 2y
We can remove the 2y from both sides to get:
4 > 6
which is a false inequality, and there is no dependence on the value of y, so this inequality has no solutions, and its graph is a number line alone.
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Suppose y varies directly with x. When x is 5, y is 15. What is y when x is 12?
Answers
Answer:
y = 36
Step-by-step explanation:
given y varies directly with x then the equation relating them is
y = kx ← k is the constant of variation
to find k use the condition when x = 5 , y = 15
15 = 5k ( divide both sides by 5 )
3 = k
y = 3x ← equation of variation
when x = 12 , then
y = 3 × 12 = 36
A number n minus the sum of the number and eight
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The algebraic expression for the sentence in this problem is given as follows:
n - (x + 8).
How to obtain the algebraic expression for the sentence?The sentence in this problem is given as follows:
"A number n minus the sum of the number and eight".
The sum of an unknown number x and eight is given as follows:
x + 8.
The subtraction of the number n by the expression is given as follows:
n - (x + 8).
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