help please Steps to Completing This Discussion Based Assessment: Complete ONE problem from each of the 6 parts on the assignment attached below. You need to show work for each of the 6 problems you choose to do.

Part A number 2 (see work below)

*please give me brainliest lol*

Step-by-step explanation:

(8r^3 + 2r^2 + 1) - (7 - 7r^3 + 3r^2)

after factoring out the negative, you'll have:

8r^3 + 2r^2 + 1    -7 + 7r^3 - 3r^2

now we combine like terms, and your answer is:

15r^3 - r^2 - 6

hope this helps!

phosphate, calcium ion, chloride ion, neon atom

step-by-step explanation:

i think the length is 12 and the width is 17