Complete the equation of the line through (2,17) and (4,31)

What is the area of triangle abc if a = 8, b = 11, and c = 15?

The parabola x = y² - 9 opens: a.)up b.)down c.) right d.)left

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).