Dion went out to lunch. the bill, including tax, was $30. dion left a tip of $6. what percent of the bill did dion leave as tip?

Acircular hot tub located near the middle of a rectangular patio has a diameter of 48 inches. the patio measures 11 feet by 6 feet. what is the area of the patio that is not covered by the hot tub?

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

Maria walks a round trip of 0.75 mile to school every day.how many miles will she walk in 4.5 days