Plz help.

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.

Franco wants to double the volume of the cone. what should he do?

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