8
The sum of the interior angles of which
polygon is 1,800°?
A )Triangle
B )Heptagon
C )Octagon
D )Dodecagon

What is the common difference for this arithmetic sequence? -6,-2,2,6,10 a.4 b.5 c.3 d.6

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]

Iknow the answer but the calculator doesn't seem to give the right one