What is the measure of a° ! show work if possible

You paint a 1/2 of a wall in 1/4 hour. how long will it take you to paint one wall

Asquare has a side that measures 11 units. what is the area of a circle with a circumference that equals the perimeter of the square? use 3.14 for π, and round your answer to the nearest hundredth. 1519.76 units2 379.94 units2 616.56 units2 154.14 units2

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?