Derek is hand gliding on a clear day at an altitude of a feet. His visibility, v, is 67.1 mi. Use the formula   to find the altitude at which Derek is hand gliding.

Hint:

In this question, we have to find the altitude at which Derek is flying , a. If it is given that the visibility, v is 67.1 mi , and the formula given is For finding the value of  a we need to put the value of v in the formula, further we will cross multiply and will get the value of . Later, we will square both the sides to get the value of a. The value obtained will be the altitude at which Derek is flying.