In order to estimate the height of an Ailanthus altissima tree, botanists have developed he formula h

Question:

In order to estimate the height of an Ailanthus altissima tree, botanists have developed he formula h = 5/3d0.8 where h is the height in meters and d is the diameter in centimeters.
a. If the height of an Ailanthus altissima tree is 18 m, find the diameter.
b. If the circumference of an Ailanthus altissima tree is 87 cm, estimate its height.