What is 30% of 70. show your work

An an average person has 6×10 by the power of two as many red blood cells as white blood cells a small sample of the blood has 7×10 by the power of three white blood cells about how many red blood cells are in the sample

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

43lbs of tomatos cost $387. how much would 41lbs cost