A store purchased gas-powered toy cars for $4,500 and sold them for $6,622. What is themark-up, as a percentage? NEED HELP NOW PLZ

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

How many ordered pairs of positive integers satisfy xy=32?

Robin spent 25% more time on his research project than he had planned he’s been an extra h ours on the project which of the following expressions could represent the number of hours rob actually spent on the project