Aspherical water balloon is filled such that it has a diameter of 9 inches. water is then released from the balloon until it has a diameter of 7.2 inches. approximately what volume of water was released from the balloon? a.3 in³ b.186 in³ c.195 in³ d.1489 in³

To find the approximate volume that was released you will find the volume of the sphere before and after the water was released and subtract them.  Use the formula for finding the volume of a sphere to do this.

Before:  

V=4/3 x pi x r^3
    4/3 x 3.14 x 4.5^3
V = 381.51 cubic inches

After:

V=4/3 x pi x r^3
    4/3 x 3.14 x 3.6^3
V = 195.33 cubic inches

381.51 - 195.33 = 186.18 cubic inches

The answer is choice B.

Then just do it (lol)

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.