Help me please on this question

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.

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

Could someone me with this question i’ve been stuck on it for 20 minutes