I need help on 16 17 and 18

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.

You work in a hospital that has 9 floors. you need to see 3 patients on each floor. how many patients do you need to see in all?

Pls math have no ideamultiply and simppify. 2x^2y^3z^2 • 4xy^4x^2