Jackson owes his sister monica $15. monica has a $10 bill in her pocket. explain the meaning of zero in this situation .?

Answer question above and explain each step : )

Richard save $32 in march he saved $48 in april and $38 in may then richard spent $113 on a keyboard how much money does richard have left

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?