Trudy's bill for lunch at a restaurant was $99. She left a 15% tip. What was the amount of the tip?

The graph of y = ax^2 + bx + c is a parabola that opens up and has a vertex at (0, 5). what is the solution set of the related equation 0 = ax%2 + bx + c?

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?

What is the area of the original rectangle? 8 cm² 20 cm² 25 cm² 40 cm²