Carla and Rob left a 20% tip after having lunch at a restaurant. The amount of the tip was $6. Carla's lunch cost $15. Write an equation you can use to find x, the cost of Rob's lunch.

Acylinder has volume 45π and radius 3. what is it’s height?

What is the volume of a cone with a height of 6 cm in the radius of 2 cm

Someone answer asap for ! the total ticket sales for a high school basketball game were $2,260. the ticket price for students were $2.25 less than the adult ticket price. the number of adult tickets sold was 230, and the number of student tickets sold was 180. what was the price of an adult ticket?