The total cost f(x), in dollars, for renting a bike for x hours is shown:
f(x) = 10 + 20x
what does f(10) represent?
a. the number of miles the bike can travel for a cost of $10  the b. number of miles the bike travels in 10 hours  the number of c. hours the bike can be rented for a cost of $10  the number of d. dollars it costs to rent the bike for 10 hours

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.