In this particular arithmetic sequence, a7 = 50 and a15 = 114. what is the value of a21? hint: an = a1 + d(n − 1), where a1 is the first term and d is the common difference.

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

The art class is planning to paint a mural on an outside wall. this figure is a scale drawing of the wall. width: 11 in length: 28 in unit rate: 1.5 ft per in. write the ratio of the area of the drawing to the area of the actual mural. write your answer as a unit rate. show that this unit rate is equal to the square of the unit rate 1.5 ft per in

Having a hard time understanding this question (see attachment).