27.5.SUBSTITUTE 3 FOR XIN THE FUNCTION F(X) = WALLS

29.27.5.Substitute 3 for xin the function f(x) = walls: 2(12 ×8) + 2(16 ×8) = 448. Since 13x

2

+ 2

–x

+

3

8

to get f(3) = 3(3)

2

+ 2

–3

+

3

8

=gallon of paint provides coverage of an area3(9) +

2

1

3

+

3

8

= 27 +

1

8

+

3

8

= 27 +

4

8

= 27.5.150 square feet, simply divide 448 by 150,