The sum of the interior angles in a polygon is 15,480°. Calculate the number of sides in the regular polygon.

Find the lateral surface area plzzz

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.

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle