Multiply. Reduce to lowest terms.
2 1/7 x 4 3/8

Parabolas y=−2x^2 and y=2x^2 +k intersect at points a and b that are in the third and the fourth quadrants respectively. find k if length of the segment ab is 5.

The radius of a sphere is 3 inches. which represents the volume of the sphere?

Write the equation in general quadratic form: plz !