Neee help it will be much appreciated

Solve the equation: x - 9 = -6 + 5 a. 21 b. 7 c. 14 d. 2

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]

Apply distributive property to write equivalent equation 105×35m