A number increased by thirty-five

Which expression is equivalent to 3^3 + 2^2?

See attachment below and find the equivalent of tan(∠qsr)

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]