Write an equation of the parabola in vertex form that passes through (-7, -15) and has vertex (-5, 9)

16x^2-16x=5 solve the equation by completing the square

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.

Sate why the measure of angle d is 120 degrees