Solve this pls

Simonne used the following steps to simplify the given expression. 12 - 3(-2x + 4) step 1: 12 + (–3)·(–2x) + (–3)·(4) step 2: 12 + 6x + (–12) step 3: 12 + (–12) + 6x step 4: 0 + 6x step 5: 6x what property of real numbers was used to transition from step 3 to step 4? a. identity property of addition b. inverse property of addition c. associative property of addition d. commutative property of addition

Use the data on the dot plot to answer the question.how many people read for more than three hours last week? i'm on a unit test review

Find an bif a = {3, 6, 9, 12) and b = {2, 4, 6, 8, 10).