Acircle has a central measure 7pi/5 radians that intersect an arc of length 18 cm what is the length of the radius of the circle

Ithink the answer will be d yes

Where are the functions?

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.