Answer:
1.75
Step-by-step explanation:
If a and b are two numbers, then their arithmetic mean is

Given:

Divide this equation by 10:

Now, divide it by 2:

The tank fills to 16 gallons of water as a maximum. After that it would start overflowing.
Answer:
V=2(1+2)a2h
Step-by-step explanation:
Twice a number (2x) decreased by 7 (- 7).
2x - 7
Two times a specfic number (x) subtracted by 7.