The cost depends upon the number of long distance minutes, m, Amy uses. Write the rule that describes Amy's monthly cost.

Mathematics

1 answer:

Yuri [45]3 years ago

3 0

Minutes(m) Cost
0 20
10 22
20 24
50 30

slope formula:
m = (y1 - y2) / (x1 - x2)
m = (20 - 22) / (0 - 10) = -2/-10 = 1/5 or 0.20

y = (1/5)(x) + 20

The rule that describes Amy's monthly cost is:
m = 1/5x + 20 or m = 0.20x + 20

Where x is the number of minutes spent on the call.

You might be interested in

8 less than the quotient of 18and a number m

antoniya [11.8K]

Answer:

8-18/m

fjsfkjkj

4 0

3 years ago

A road is 3/5 of a mile long. A crew needs to repave 3/4 of the road. How long is the section that needs to be repaved? Write yo

storchak [24]

Answer:

9/20 mile

Step-by-step explanation:

Take (calculate) 3/4 of 3/5 mile:

3 3

---- * ---- = 9/20

4 5

9/20 mile needs to be repaved.

6 0

3 years ago

A normal population has a mean of 19 and a standard deviation of 5.

dangina [55]

Answer:

a) $Z = 1.2$

b) 38.49% of the population is between 19 and 25.

c) 34.46% of the population is less than 17.

Step-by-step explanation:

Problems of normally distributed samples can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by

$Z = \frac{X - \mu}{\sigma}$

After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X. If we need to find the probability that the measure is larger than X, it is 1 subtracted by this pvalue.

For this problem, we have that

A normal population has a mean of 19 and a standard deviation of 5, so $\mu = 19, \sigma = 5$ .