Solve the equation x^2-4x-21=0

What is the area of triangle abc if a = 8, b = 11, and c = 15?

Based on the figures as marked, /\rqs = —

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