Which of the following other pairs of angles are complementary?
select all that apply.
a. ∠a and ∠c
b. ∠b and ∠f
c. ∠c and ∠d
d. ∠f and ∠e

For the equations below which statement is true ? -2x=14 6x=-42

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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