3x - 5y = -16
2x + 5y = 31
solve the system. write your answer as an ordered pair (x, y).

Pam buys a sleeve of ball bearings for her skateboard. each of the bearings is 1 1/5 inches wide. the sleeve is 9 3/5 inches long. how many ball bearings are in the sleeve? show your work.

Nikolas calculated the volume of the prism. his work is shown below.

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.