Answer:
hmmmm. probably 2? I think it's two
If you are trying to figure out how much it will cost:
8 x 4 = 32
Cost of gas = $32
Answer:
Shown below
Step-by-step explanation:
First allocate the power of three to every number
= 
not sure what you mean by positive exponents, the exponents already are positive. Maybe you mean positive exponents and integers?
Answer:78.396 pounds
Step-by-step explanation:
Answer: number of adults = 3, number of children = 5
Step-by-step explanation:
let the number of adults be x, and the number of children be y.
x + y = 8 , 15x + 8y = 85
1st equation x 8 = 8x + 8y = 64

substitute x=3
