Simplify -3p 3 + 5p + (-2p 2) + (-4) - 12p + 5 - (-8p 3). select the answer in descending powers of p.

a. 1 - 7p - 2p2 + 5p3
b. 5p3 - 2p2 - 7p + 1
c. 1 + 7p + 2p2 - 5p3
d. -5p3 + 2p2 + 7p + 1

I’m stuck on this i don’t understand.

Create a real-life situation and create a system and show how it might be modeled algebraically with a system of equations (or inequalities) show all work include a few sentences explaining the situation, your variables of choice and what each represents, and how you would set it up and solve it algebraically. !

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