Mrs. McCullough is purchasing balloons for a party. Each spherical balloon is inflated with helium. How much helium is in the balloon if
the balloon has a radius of 9 centimeters? Round to the nearest
tenth. Hint: the amount of helium a balloon can hold is its volume.
A. 37.68
B. 339.12
C. 159.2
D. 313

When i did the math i got 11 cm

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.