Please help with numbers 4 and 5

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Determine the volume of a cylinder bucket if the diameter is 8.5 in. and the height is 11.5 in.

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left