Answer:
<u>Given</u>: base = 10.4ft, height = 12.5
Area of octagon = 8(1/2 × b × h)
- 8(1/2 × 10.4 × 12.5)
- 520ft²
Volume of pool = 520ft² × 3ft
Now, 1 cubic ft takes 7.5 gallons to fill.
Therefore, 1560 cubic ft takes,
So, <u>Correct choice</u> - [D] 11,700.
Answer:

Step-by-step explanation:
convert mixed number to improper fractions
3
=

apply the fraction rule:

multiply the numbers

Answer:
60
Step-by-step explanation:
210÷3.5=60
3.5x60=210
Hope this helps!
: )