Please HELP ME

Simplify each polynomial Write in standard form (Hint: watch for the operations, add, sub , multiply)

(6s^4+7s^2+7)+(8s^4-11s^2+9s)

(4h^3+3h+1)-(-5h^3+6h-2)

(8z^3-3z^2-7)-(z^3-z^2+9)

I just need the answers to these these few problems I just cannot seem to figure them out!!!

1 answer

add like-terms:
1. 14s^4 - 4s^2 + 9s + 7.

Use same procedure for the remaining problems.
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