What percent of $70,000 = $49,000

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

Which of the following transformations will always produce a congruent figure?

Solve the equation by completing the square. x^2+2x=17