What is the radius of a cylinder with a volume of 198 m3 and a height of 10 m?

7x+8y=-18, 4x-9y=-3 solve the system of equations

Determine the number of girls in a math class with 87 boys if there are 25 girls for every 75 boys

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