Please help me solve this question

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?