John is moving up to the attic and wants to paint one wall blue. The wall is a triangle with a base of 21 feet and a height of 8 feet. What is the area of the wall to be painted? A. 42 ft2
B. 62 ft2
C. 29 ft2
D. 84 ft2

84

Step-by-step explanation:

A traingle's area is base x height / 2.

21 x 8 = 168

168/2 = 84

i hope this is what you were looking for.

see attached graph

u = -(6/7)w

step-by-step explanation:

place all values with 'u' on one side of the equation.

4u + 8w = - 3u + 2w

4u + 3u = 2w - 8w

further simplify the equation by solving the addition and subtraction.

7u = - 6w

make 'u' the independent variable by placing its co-efficient on the right-hand side.

u = - (6/7)w