Can someone plz help me with this one problem plz I’m trying to get an 92

Look at this pattern ; 1,4,9, number 10000 belongs in this pattern . what’s the place of this number?

5, 6, 10 question: a. determine whether the side lengths form a triangle. (explain your reasoning) b. if it is a triangle, determine whether it is a right, acute, or obtuse triangle. (show your work)

Write the factored form of this trinomial 9x^2+18x-7