The figure below is a right triangle. Which equation describes the relationship between the side lengths? x2 + y2 = z2
x2 + z2 = y2
x2 – y2 = z2
y2 – x2 = z2

The volume of a spherical hot air balloon v(r) = 4 3 ? r3 changes as its radius changes. the radius is a function of time given by r(t) = 3t. find the instantaneous rate of change of the volume with respect to t at t = 2.