An airplane takes off and travels 56 ground miles to achieve an altitude of 12.6 miles. What is the angle of elevation of the airplane's path?

Evaluate the expression for the given value of the variable 2×(c2-5) for c=4

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

A50-foot ladder is leaning against a vertical wall. if the base of the ladder is 45 feet from the base of the wall, find the angle the bottling of the ladder makes with the ground.