The 100th term of 50, 80, 110 is??

(40 points) i need some . an answer definition is appreciated as well.

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12