Calculate the area of the 2d shape​

Convert 16 yards to feet use the conversion rate 3 feet = 1 yard

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

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).