The Smith family went out to dinner and received great service. They decided to leave a 20% tip for their waitress. If their dinner bil totaled $90, how much was the
tip? Think You need to find what percent of what number? Show your work

What is x and y (use substitution? ) 5x+3y=38 and y=3x+8?

The volume of gas a balloon can hold varies directly as the cube of its radius. imagine a balloon with a radius of 3 inches can hold 81 cubic inches of gas. how many cubic inches of gas must be released to reduce the radius down to 2 inches?

You got a job selling magazines door-to-door. you are paid $100 per day plus $1.50 for each magazine you sell. which recursive formula models this situation?