a. factor A = x^2 -30x + 225 = (x - 15)(x - 15)
side length =<u> (x - 15)</u>
b. add (x - 15) four times = 4(x - 15) =<u> 4x - 60</u>
F(-x) = 2/-x/ + 3(-x) = 2/x/ - 3x;
We first determine the cost of one pair, that is:

So, each pair of shoes cost $63.Now, we determine the value of the commission:

So, the commission for each pair of shoes is $10.71, now we multiply this by 3 times. That is:

So, the commission for the three pairs of shoes will give him $32.13.
R=5
A=πr^2
The area of the circle ≈78.54