in triangle PQR, Xand Y are the midpoint of PQ and PR respectively .if XY= 12 cm and then find the measure of QR..

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?

Solve each quadratic equation by factoring and using the zero product property. n^2 - 49 = 0

Solve this problem! extra ! 3025/5.5 = a/90.75