3c+10=16 Subtract 10 from both sides

Lisa has three classes that each last 50 minutes. what is the total number of minutes of the three classes

Find and simplify an expression for the area of five rows of x squares with side lengths of x centimeters.

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