The common ratio of a geometric series is 9, while the sum of the first 10 terms in the series is 435,848,050. what is the first term in the series?

Aright triangle has an area of 18 square inches. b: if the triangle is not an isosceles triangle, what are all the possible lengths of the legs, if the lengths are whole numbers. answer !

If a is a nonzero real number then the reciprocal of a is

Use mathematical induction to prove the statement is true for all positive integers n, or show why it is false. 1^2 + 4^2 + 7^2 + + (3n - 2)^2 = [n(6n^2-3n-1)/2]