Answer: 9420meters³
Step-by-step explanation:
The formula to calculate the volume of the cylindrical tank will be:
= πr²h.
where,
π = 3.14
r = radius = diameter/2 = 20/2 = 10
h = height = 30
Volume = πr²h
= 3.14 × 10² × 30
= 3.14 × 100 × 30
= 9420meters³
137.5 miles or 138 miles covered in 2.5 hours. (if that's what you're looking for)
Step 1. Subtract 4m from both sides
d - 4m = 7n
Step 2. Divide both sides by 7
d - 4m/7 = n
Step 3. Switch sides
n = d - 4m/7
She is incorrect, her statement comes with no solution.