Can someone pls help me with this I’ve been stuck on this problem all day

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

Which expression is equivalent to 8(k + m) − 15(2k + 5m)?

Acd that is originally priced at $15.85 red-tagged for the sale. what is the sale price of the cd