Solve. 2r/3 + 1/3 = -1/3

Marlene drove 540 miles to visit a friend. She drove 3 hours and stopped for gas. She then drove 4 hours and stopped for lunch. How many more hours did she drive if her average speed for the trip was 60 miles per hour?

Write an equation to represent the situation. The surface area S of a sphere is the product of π and the square of the radius r.

Solve. y + 5y = 90

Solve each system of equations. y = 3x - 1 y = -2x + 9

Solve. 2t/3 + 1/3 = -1/3

Al's Rentals charges $25 per hour to rent a sailboard and a wet suit. Wendy's Rentals charges$20 per hour plus $15 extra for a wet suit. Find the number of hours for which the total charges for both companies would be the same.

Solve. q + 5 = 2q + 7

Write an equation to represent the situation. The volume V of a rectangular prism is the product of its three dimensions: length l, width w, and height h.

Solve. 9(a - 2) + 15 = 33

Solve the equation, interpret the result, and graph the solution. $2 ( x - 4 ) + 3 x = x + 4 ( x - 2 )$

Solve. 6n - 4n = 68

On her last three quizzes, Elise scored 84, 96, and 88. What grade must she get on her next quiz to have an average of 90 for all four quizzes?

Solve each system of equations. y = x + 6 y = -2 x - 12