Acell phone provider offers a plan that costs $40 per month plus $0.10 per text message sent or received. a comparable plan costs $70 per month but offers unlimited text messaging. how many text messages would have to be sent or received in order for the plans to cost the same each month?

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

its an acute right triangle

step-by-step explanation: