Your new cell phone plan costs $45 per month. you pay an extra $0.05 for every text message sent. if you send 60 texts this month, how much will your bill be?

$48 is the cost this month. You multiplied 60 and $0.05, and then added $45.

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

b