Find the average:
-1,5, 4, 5, 1, -4

1

Step-by-step explanation:

you have to add all the values together and divide the total by the number of values you added together. In this situation, there is 6 values

-1 + 5 + 4 + 5 + 1 - 4 = 10

10 ÷ 6 = 1

Step-by-step explanation:

wall 25×12=300

2 walls = 600

wall2 20×12=240

2 wall2= 480

600+480= 1080 sq ft