Abaker makes cakes and sells them at county fairs his initial cost was $45 to reserve a booth and $25 traveling expenses. he figures that it costs $1.75 to make each cake and he charges $6.50 per cake. let x represent the number of cakes sold. express the revenue r and cost c as functions of x. then find how many cakes will he need to sell before he will make a profit

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.