What is the product of -0.2 and -6.8

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

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.

Which letters from the table represent like terms? a and b b and c a and d b and d