Step-by-step explanation:
First, find complete data.
That would be 2, 12 and 5, 30
Divide the output by the input to get the relationship/constant.
12/2 = 6 30/5 = 6
So...
1 x 6 = 6
and
48 / 6 = 8

The polynomial p(x) can be found by multiplying 'x-3' to every term

Now distribute and you have your answer.
5*4^2-3*4*5=80-60=20
Hope that helps you
18 inches.
This is true because 40% of 60 is 24. 75% of 24 is 18. :))