A model for a company's revenue from selling a software package is R(p) = -2.5p2 + 800p, where p is the price in dollars of the software. What price will maximize revenue? Find the maximum revenue.

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.