Dave found that about 8/9 of the students in his class have a cell phone. what percent of the students in his class do not have a cell phone?

These question are hard can you me with answers

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

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