Write an inequality that represents the following problem. there are two cell phone plans available from cell phones r us company. plan a charges $30 a month plus $0.01 for every text message. plan b charges $20 a month plus $0.05 for every text message. how many text messages do you need to send in order for plan a to be cheaper than plan b?

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1

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