Use the inverse trigonometric keys on a calculator to find the measure of angle A

Jamie is hiking up a small mountain. he climbs up at a constant rate of 300 feet/hour until he reaches the peak at 1,500 feet. after that, he hikes down at the same rate to the base of the mountain. the equation that models jamie’s elevation, e, after t hours is e = . jamie’s elevation will be 600 feet after hours and after hours.

Determine whether the set of whole numbers is closed under addition. explain why the set is or is not closed. give an example.

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?