1/4 ( x − 12 ) + 1/3 ( x + 9 )

He that is measured at 220° is a reflex angle. the opposite angle is obtuse. find the measure of obtuse .

36x2 + 49y2 = 1,764 the foci are located at: a) (-√13, 0) and (√13,0) b) (0, -√13) and (0,√13) c) (-1, 0) and (1, 0)

Acompany makes steel lids that have a diameter of 13 inches. what is the area of each lid? round your answer to the nearest hundredth