No, it is not. I will show you:
-1 = x and 2 = y
2 = -5(-1) + 7
2 is not equal to 12. I hope this is right!
The mean change of altitude in feet over feet per minute is 62ft over feet per minute
Answer:
81
Step-by-step explanation:
let the terms be a,ar,ar²
r=2/3
a+a(2/3)+a(2/3)²=171
multiply by 9
9a+6a+4a=171×9
19 a=171×9
a=(171×9)/(19)
a=9×9=81
Solve the multiplication first then the division and the subtract them to get something like this:

which simplifies to 29.7 (3 significant figure )
3/4 divide by 5 is equal to 3/20