First subtract the C to move it to the other side
c-P=b+4a
Then subtract the 4a as well
4a-c-p=b
The -9 because absolute value is the number itself without positive or negative. So it’s the 9. Hope this helps!
ANSWER
a. d+4
b. 4d+16
EXPLANATION
The area of the square coaster is represented by:

We split the middle term to obtain,

We factor by grouping to get,


Since area of a square is l² , it means the side length of the square is

b) The perimeter of a square is given by

We substitute the length in terms of d, to obtain;

Or

C) $51.53
explanation: i took the test last month