Find the rate of change for each situation
a kitten grows from 5oz at birth to 3lb 5oz at six months..hint 1lb =16oz

If 1 lb = 16 oz, then 3 lb and 5 oz = 3 * 16 + 5 = 48 + 5 = 53 oz

Kitten weighed 5 oz at birth, so to find rate of change we need to substract it from the final weight: 53 - 5 = 48 oz

To find out how many oz the kitten grew per month, we need to divide the result by 6:
 
48 ÷ 6 = 8

Rate of change is 8 oz per month.