The arch support of a bridge can be modeled by y= -0.0012x^2 where x and y are measured in feet. find the height and width of the arch

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

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

Which matrix multiplication is possible?