The circumference (c) of a swimming pool is 47 feet. which formula can you use to find the radius (r) if you know that c = 2ππr ?

47= 2 x 3.15 x r
47 = 6.3 r   (divide both sides by 6.3 to calculate the radius)
r = 7.46 

answer is rounded to nearest hundredth place

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.