Answer:
525 minutes
Step-by-step explanation:
3 weeks have 21 days
25 minutes per night is 25 * 21 minutes for 3 weeks = 525
Step 1. Subtract 3/4 from both sides
x = 1/2 - 3/4
Step 2. Simplify 1/2 - 3/4 to -1/4
x = -1/4
0.48
You use the formula V=πr2 h/3