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svetoff [14.1K]
3 years ago
6

I’ll mark you brainliest!!!!! Which situation shows a constant rate of change?

Mathematics
1 answer:
Irina-Kira [14]3 years ago
4 0

Answer:

B

Step-by-step explanation:

If we make a graph comparing the total cost of the milk and the gallons bought, it will be a straight line, which is a constant rate of change.  

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Max ran 50 meters in 10 seconds. molly ran 30 meters in 5 seconds. who ran faster
Stolb23 [73]
To compare their speed (rate), we need to have the same time or same distance to use as a reference.

Matt ran 50 meters per 10 seconds. Molly ran 30 meters per 5 seconds. If she ran for 5 more seconds, she would have gone 30 more meters, for 30 meters per 10 seconds. Thus, Molly went faster.

Alternately, you could calculate their speeds in meters per (one) second and compare. 50 meters per 10 seconds is 5 meters per second, and 30 meters per 5 seconds is 6 meters per second.
8 0
3 years ago
Read 2 more answers
14. Alex earns $7.50 per hour by working after school. He should have at least $60 for buying a video
slavikrds [6]

Answer:

7.50x = 60

x = 8

Step-by-step explanation:

He would have to work 8 hours because 8*7.50=60

Hope I helped :)

8 0
3 years ago
Read 2 more answers
The distribution of heights for adult men in a certain population is approximately normal with mean 70 inches and standard devia
KengaRu [80]

Answer:

The interval (meassured in Inches) that represent the middle 80% of the heights is [64.88, 75.12]

Step-by-step explanation:

I beleive those options corresponds to another question, i will ignore them. We want to know an interval in which the probability that a height falls there is 0.8.

In such interval, the probability that a value is higher than the right end of the interval is (1-0.8)/2 = 0.1

If X is the distribuition of heights, then we want z such that P(X > z) = 0.1. We will take W, the standarization of X, wth distribution N(0,1)

W = \frac{X-\mu}{\sigma} = \frac{X-70}{4}

The values of the cumulative distribution function of W, denoted by \phi , can be found in the attached file. Lets call y = \frac{z-70}{4} . We have

0.1 = P(X > z) = P(\frac{X-70}{4} > \frac{z-70}{4}) = P(W > y) = 1-\phi(y)

Thus

\phi(y) = 1-0.1 = 0.9

by looking at the table, we find that y = 1.28, therefore

\frac{z-70}{4} = 1.28\\z = 1.28*4+70 = 75.12

The other end of the interval is the symmetrical of 75.12 respect to 70, hence it is 70- (75.12-70) = 64.88.

The interval (meassured in Inches) that represent the middle 80% of the heights is [64.88, 75.12] .

Download pdf
8 0
3 years ago
Binh has to write an 8-page report. If he has written 3/4 of his report so far, how many pages has he written?
Eva8 [605]

Answer:

6 pages

Step-by-step explanation:

3/4 = 8 = 2 = 1/2 = 3/4 / 8 = 6

This is confusing to understand but that's how I solved it.

4 0
2 years ago
Which answer is a solution to the inequality?
sergey [27]

Answer:

B

Step-by-step explanation:

To determine which ordered pair is a solution, substitute the coordinates of the point into the left side of the inequality and if it satisfies the inequality then it is a solution.

A (- 3, 0 )

- 9 + 0 = - 9 < -8 → (- 3, 0) is not a solution

B (- 2, - 1)

- 6 - 1 = - 7 > - 8 → ( - 2, - 1) is a solution

C (0, - 10)

0 - 10 = - 10 < - 8 → (0, - 10) is not a solution

D (2, - 16)

6 - 16 = - 10 < - 8 → (2, - 16) is not a solution


8 0
3 years ago
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