Cos theta + cot theta equal to K then prove that sin theta equal to 2 k by K square + 1​

Find the measures of the complement and the supplement of each angle, m

Af jewelry box is in the shape of a rectangular prism with an area of 528 cube inches. the length of the box is 12 inches and the height is 5 1/2 inches. what is the width of the jewelry box

In a singing competition, there are 150 participants. at the end of each round, 40% of the participants are eliminated. how many participants are left after n rounds?