9.If a = 1 + 3jand 5 = 27 + 1. Find the angle between aand b.​

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

The figure shows the front side of a metal desk in the shape of a trapezoid. what is the area of this trapezoid? 10 ft²16 ft²32 ft²61 ft²

My hour hand points between the 8 and the 9 in 35 minutes it will be the next hour. what time is it ?