What is the simplified form of the quantity 4 z squared plus 16z plus 15 over the quantity 2 z squared minus z minus 15?

Because both of those expressions are second degree polynomials, you are going to get a whole number with a remainder.  Since 2 goes into 4 twice, our whole number is 2.  If we do the multiplication and subsequent subtraction, we have a remainder of 18z + 45.  So our simplification, if you can call it that (it's really not that simple) is

Looks pretty good to me!

110698.56 square miles

step-by-step explanation:

multiply 3.8 by 102

387.6

multiply 2.8 by 102

285.6

multiply those two to get

110698.56 square miles