F(x)=4x-9? when the value is f(-3)

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.

There is 240 red cars and there is 400 blue cars because 240/3=80 and 80*5=400