Can anyone me? i’m stuck big time.

Joe has some money in his bank account he deposits 45$ write an expression that represents the amount of money in joe's account

Campus rentals rents 2 and 3 bedrooms apartments for $700 ans $900 a month respectively. last month they had six vacant apartments and reported $4600 in lost rent. how many of each type of apartment were vacant?

Varies inversely with x. if y=8.5 when x=-1 find x when y=-1