For the lines to the left, find the following: a
y-intercept
_
slope
_
slope-intercept equation
_

b
y-intercept
_
slope
_
slope-intercept equation
_

c
y-intercept
_
slope
_
slope-intercept equation
_

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.