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2 years ago

If a mechanic takes 4 hours to complete 8 car inspections, at what rate are the cars being inspected?

Mathematics

2 answers:

Marta_Voda [28]2 years ago

8 0

<em>1 car per 30 minutes.</em>

Ghella [55]2 years ago

3 0

Answer:

The answer is 1 car per 30 minutes

Step-by-step explanation:

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Can someone help please

Artyom0805 [142]

Answer:

62 newspapers

Step-by-step explanation:

Let s represent the number of Sunday papers sold. Then s/2 is the number of Friday papers sold. The total revenue is ...

1.50s + 0.75(s/2) = 116.25

1.875s = 116.25 . . . . simplify

s = 116.25/1.875 = 62 . . . . . divide by the coefficient of s

62 Sunday papers were sold.

6 0

3 years ago

12ab = 4 solve for a

WITCHER [35]

Answer:

-3

Step-by-step explanation:

8 0

3 years ago

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Find the equation of the line (in slope intercept form) if the slope of the line is (-5/6) and the point (12,9) is a point on th

horsena [70]

(y=mx+b) Where m is slope and b is y-int.
y=-5/6x-1

6 0

3 years ago

Point S is located on RT so that RS/ST = 1/4. What are the coordinates of Point S? (4 , 4 ) (2.4, 2.4) (8 , 8 ) (4.4, 4.4)

valina [46]

Answer:

(4.4, 4.4)

Step-by-step explanation:

The point S can be found as the weighted average of the end points. The relative weights are the reverse of the distances to the end points:

RS : ST = 1 : 4

S = (4R +1T)/5

S = (4(2, 2) +(14, 14))/5 = (22, 22)/5

S = (4.4, 4.4)

6 0

3 years ago

The Highway Safety Department wants to study the driving habits of individuals. A sample of 40 cars traveling on a particular st

Ipatiy [6.2K]

Answer:

We need a sample size of at least 101

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.99}{2} = 0.005$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.005 = 0.995$ , so $z = 2.575$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

What sample size is needed to estimate the true average speed to within 2 mph at 99% confidence?

We need a sample of at least n.

n is found when M = 2. So

$M = z*\frac{\sigma}{\sqrt{n}}$

$2 = 2.575*\frac{7.8}{\sqrt{n}}$

$2\sqrt{n} = 2.575*7.8$

$\sqrt{n} = \frac{2.575*7.8}{2}$

$(\sqrt{n})^{2} = (\frac{2.575*7.8}{2})^{2}$

$n = 100.85$

Rounding up

We need a sample size of at least 101

8 0

3 years ago

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