A life guard in a tower 10 ft above sea level spots a struggling surfer at an angle of depression of 15 degrees. How far is the surfer from the base of the tower?

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6

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.

With this question, the answer with the red arrow is incorrect!