Pls help me giving brainless.​

Tracy solved the following problem. which of the statements is true? 9 ÷ 3 + 6 × 2 3 + 6 × 2 9 × 2 18 her answer is correct. her answer is incorrect. she should have multiplied before dividing. her answer is incorrect. she should have multiplied before adding. her answer is incorrect. she should have added before dividing.

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

Ihave trouble finding the nth term of a linear sequence