Answer: A total descent of 8260 feet occurred for all four balloons.
Step-by-step explanation:
Based on the information provided:
Number of hot air balloons = 4
Minutes of descent = 7
Descent rate per minute = 295 feet
Thus, the overall change in altitude for all four balloons can be calculated as:

Thus, a total descent of 8260 feet was experienced by the four balloons.
629.20 divided by 520 equals 1.21
Power of 6V1.21 equals 1.0323
Interest rate is 3.23
(a) For E based on d, the equation is E = 6500 - 50d
(b) After 30 days, the remaining excess will be 5000.
Seven hundred nineteen thousand, nine hundred twenty-seven