Aisha is cleaning her fish tank, which has a volume of 2082.5 inches. After cleaning the fish tank, Aisha will refill it with water, If one gallon of water is equivalent to 231 inches, about how many gallons of water are needed to fill the tank.

Abari owns 100 shares of stock a and 45 shares of stock b. for the past month, his stocks have been fluctuating inversely. stock a decreased by m cents per share and stock b increased by n cents per share. which equation can be used to find the total change in value of jabari's shares per month?