Which of the following pairs of expressions are equivalent?

Question

12⋅t+6 and 12(t+12)

6(y+3) and 6⋅y+3

8⋅c+40 and 8(c−5)

−5(a−1) and −5⋅a−5

Answer 1

12⋅t+6 and 12(t+6)

6(y+3) and 6⋅y+18

8⋅c+40 and 8c−40

−5(a−1) and −5⋅a+5