10) 28n4 + 16n? – 80n² = 0
factoring quadratic

2n(14n^2+3)=28n^4+16n I'm not sure if you meant to put the question mark between or not but I did it separately for -80^2=0 n would equal zero hope this helped

Step-by-step explanation:

I ask a moderator to delete my answer.

I worked in LATEX and my time was over and I lost everything.

a = 3.14

b = 18

c = 18/5 or 3.6 or 3 3/5

step-by-step explanation:

it would open into a square depending on the type of envelope i’m not sure about the second part