Ms. Taylor drew a circle on the promethean board and labeled the radius as 9 inches. What is the area of the circle in square inches?

Two sides of a triangle mesure 20cm and 30cm. what is the measure of the third side

Jack has a piece of red ribbon that is two times as long as his piece of blue ribbon. he says that he can use two different equation to find out how long his piece of red ribbon is compared to his piece of blue ribbon is. is he correct? explain his reasoning

Jack did 3/5 of all problems on his weekend homework before sunday. on sunday he solved 1/3 of what was left and the last 4 problems. how many problems were assigned for the weekend?