The red line and the blue line trains just arrived at the the station when will they arrived at the next station at the same time? red line = 8 minutes blue line = 10 minutes

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

Ineed here’s a picture of the question

The curved part of the figure is the semicircle what is the best approximation for the area of this figure