Please help on this question, I will really appreciate it. I will definitely give brainliest to the answer whom gives the full PROOF, answer, and the statement and reason.

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

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m

Divide. –4.2 ÷ 6 = a –0.7 b 0.7 c –7 d 7 me