Alan went to the mall with $28 in his wallet. he bought a pretzel dog for $4 and he bought lunch. he forgot how much his lunch cost, but he did have $7 left in his wallet. alan created this equation : 28$-($4+l)=7

Dropping less than two inches per mile after emerging from the mountains, a river drains into the ocean. one day's discharge at its mouth, 5.6 trillion gallons, could supply all of country a's households for seven months. based on this statement, determine how much water an average household uses each month. assume that there are 100 million households in country a. country a uses approximately nothing gallons per household per month.

I’m stuck on this equation, anyone got the answer?

Astraight water slide is 175 feet above ground and is 200 feet long. what is the angle of depression to the bottom of the slide?