Can someone help me with this?

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 solutions for a triangle with a =16, c =12, and b = 63º

Find an equation of the line perpendicular to the graph of 28x-7y=9 that passes through the point at (4,1)