My mom is making me do this and 2 others, which was PAST, I did them but at like 75%,why make me redo them if their PAST *starts getting stressed* whatever, please help

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

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?