A rectangle has length x and width y. Select all the statements that must be true. (Please answer ASAP thank u)

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

3x = 729 solve for x plz . it's urgent. will mark

What is the midpoint of np if n (1,9) and p (-5-1)