Akitten grows from 5oz at birth to 3lb 5oz at 6 months (find the rate of change)

Well, 16 oz is one pound. 16 * 3 is 48. It's not 16 * 3 +5 because it started out at 5oz. 48 oz in 6 months then. Divide 48 by 6. I believe it is 8oz per month. Not positive though.

The rate of change is going to be about 8 oz per moth 

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.