Me with number one it is due soon! i have absolutely no idea how to do it, but i know the awnser is 49 pie( math symbol) for 1. but i don't know how that person got that? ! me figure this out if you know.

Area of a circle = PI * radius ^2
Area of a circle = PI * 7 * 7
Area of a circle = PI * 49
or it equals 49 * PI

(by the way it is "pi" and NOT "pie")

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.