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3 years ago

Can somebody plz help answer all these questions CORRECT thanksss!

Mathematics

1 answer:

Natali5045456 [20]3 years ago

3 0

Answer:

37%, 93%, 58%, 21%, 54%, 13%, 34%, 90%, 80%, 52%, 35%

Step-by-step explanation:

37/100 = 37%, 93/100 = 93%, 58/100 = 58%, 21/100 = 21%, 54/100 = 54%, 13/100 = 13%, 17/50 = 34/100 = 34%, 9/10 = 90/100 = 90%, 4/5 = 80/100 = 80%, 13/25 = 52/100 = 52%, 7/20 = 35/100 = 35%

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Two mechanics worked on a car. The first mechanic worked for 10 hours, and the second mechanic worked for 15 hours together they

riadik2000 [5.3K]

Answer:

Step-by-step explanation:

We need a system of equations here, 2 equations for 2 unknowns. The unknowns will be x and y and will represent the rates of 2 mechanics. The first equation will relate the 2 mechanics' rates and the second will involve the total they charged at their respective rates having worked a specific number of hours on the car.

We are told that the 2 rates added together was 170 per hour, so the first equation will be

x + y = 170

The next equation will be the rates times the number of hours worked:

10x + 15y = 2175 This means that the mechanic charging x dollars per hour worked on the car for 10 hours, and the mechanic charging y dollare per hour worked on the car for 15 hours, and that the amount this added up to was 2175.

We solve the first equation for y, just because. You could also solve it for x, if you want. Doesn't matter; you'll get the same answer either way.

y = 170 - x and sub that for y in the the second equation. Then we will have an equation with only 1 unknown in it:

10x + 15(170 - x) = 2175 and

10x + 2550 - 15x = 2175 and

-5x = -375 so

x = 75. One mechanic, the one who worked for 10 hours on te car, charges 75 per hour. To find out how much the other guycharges, go back to the first equation and sub in 75 for x:

75 + y = 170 so

y = 95 per hour.

6 0

3 years ago

Write 3 numbers that make this inequality true: x>4

Trava [24]

Answer:

8, 10, 24

(Basically every number above 4)

5 0

3 years ago

Read 2 more answers

Which equation is the slope-intercept form of the line that passes through (6, –11) and is parallel to the graph of y = –2/3x +

IRINA_888 [86]

Answer:

<h2>The answer is option A</h2>

Step-by-step explanation:

Equation of a line is y = mx + c

where

m is the slope

c is the y intercept

To find the equation of the parallel line we must first find the slope of the original line

From the question the original line is

y = - ⅔x + 12

Comparing with the general equation above

Slope = -⅔

Since the lines are parallel their slope are also the same

Slope of parallel line = - ⅔

The equation of the line using point

(6, –11) and slope - ⅔ is

$y + 11 = - \frac{2}{3} (x - 6) \\ y + 11 = - \frac{2}{3} x + 4 \\ y = - \frac{2}{3} x + 4 - 11$

We have the final answer as

$y = - \frac{2}{ 3 } x - 7 \\$

Hope this helps you

3 0

3 years ago

Make sure u have explanation pls

Orlov [11]

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4 0

3 years ago

Which formula is used to calculate the standard deviation of sample data?

Illusion [34]

Answer:

$s=\sqrt{\frac{\sum (x_{i} -\mu)^{2} }{N-1} }$

Step-by-step explanation:

In statistics, the standard deviation is a measure about the amount of variation of a dataset.

The variation is measured through comparison between each data and the mean of the dataset. This way, we could get a numerical information about how far are those values form the mean (which represents the central value).

The formula to find the standard deviation of a sample is

$s=\sqrt{\frac{\sum (x_{i} -\mu)^{2} }{N-1} }$

Where $\mu$ is the sample mean and $N$ is the total number of values there are.

In the formula you can notice the difference between each value ( $x_{i}$ ) and the mean ( $\mu$ ), That's why the standard deviation is commonly use to measure variation.

Therefore, the answer is

$s=\sqrt{\frac{\sum (x_{i} -\mu)^{2} }{N-1} }$

8 0

3 years ago