7. A cellphone company charges $5 for 250 text messages. How much does the company charge for 300 text messages?

$6

Step-by-step explanation:

5$ for 250 is 1$ for 50

Multiply 50 by 6 to get 300 for $6

step-by-step :

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have