How do we express four less than
the square of a number?

a^2 - 4

Step-by-step explanation: Since the square of a number is equal to that number to the power of 2, let a represent the number bring squared. You then subtract 4 from that, addressing the four less in the problem.

chicken chicken chicken

step-by-step explanation:

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