3(j+2)-2 I don't know plz help

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

Which describes the difference between the graph of f(x)=x^2 and g(x)=-(x^2-2)

Bob the builder is making 480kg of cement mix. this is made by cement, sand and gravel in the ratio 1: 3: 4