Simplify the sum. (2u3 + 6u2 + 3) + (2u3 – 7u + 6)
a. 9 – 7u + 6u2 + 4u3
b. 0u3 + 6u2 – 7u + 9
c. 0u3 – 7u2 + 6u – 9
d. 4u3 + 6u2 – 7u + 9

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

Will give brainliest b. describe the function over each part of its domain. state whether it is constant, increasing, or decreasing, and state the slope over each part.

Would greatly appreciate these 3 answers