Answer:
I think this is true
1) 3x+3y-12
2) 4a-4b
4) 7t-98
5) 6x-54
7) 8m-4n
8) -3x+18y
4 ft
Step-by-step explanation:
Area = 30 square ft
base = 7.5 ft
Mean = 24
Variance = 107.78
Standard deviation = 10.38
Hope this helps! :)