which of the following is an example of a set of like terms? A: (19y, 19, y) B: (18x, -x, 21x) C: (15, 20, 25y) D: (-2x, -2y, -2xy)

I'm being volume of cylinder with 13 in. radius and 30 in height answer choices in pic

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

If the dimensions of a rectangular prism are 5 ft x 3.5 ft x 2 ſt, what is the surface area?