I don't know how to start on this question

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

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

If c(x) = 4x – 2 and d(x) = x2 + 5x, what is (cxd)(x)