Please help asap 1-9 i don’t really need help with 5 though.

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

What is coefficient of the term of degree of degree 5 in the polynomial below

Solve x+3y=6 and 4x-6y=6 by elimination . show work !