Rotation 90° counterclockwise around the origin of the point (-8,1)​

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

Find the value of x for which line a is parallel to line b

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.