The expression 5x^2 + 25x + 70 can be used to estimate the height, in meters, of a toy rocket x seconds after it is launched from a platform.
How many seconds does it take the rocket to hit the ground?

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

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Collin did the work to see if 10 is a solution to the equation r/4=2.4