What is the easiest way to group quadratics?

John bought 5 lemons and used 2 of them for a salad how much did he use for.a salad . he used % of the lemons.

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.

On a piece of paper graph f(x)=5•(0.4)^x