7. A jewelry salesperson earns a base salary of 200 a week plus 25% of all of her sales over 300. This situation can be represented by the expression: 200+.25(x-300) Which of the following describes the meaning of the variable "z" for this situation? the total amount of salary earned the total amount of sales after the first 300 the amount of commission earned the total amount of sales

## Step 1<br />The problem presents a situation where a jewelry salesperson earns a base salary of $200 per week plus 25% of all her sales over $300. The expression given to represent this situation is \(200+.25(x-300)\).<br /><br />## Step 2<br />In this expression, 'x' is the variable. The problem asks us to determine what 'x' represents in this context.<br /><br />## Step 3<br />Looking at the expression, 'x' is subtracted by 300 and then multiplied by 0.25 (which is the decimal equivalent of 25%). This suggests that 'x' represents the amount of sales over $300.<br /><br />## Step 4<br />Therefore, 'x' does not represent the total amount of salary earned, the total amount of sales after the first $300, or the total amount of sales. Instead, 'x' represents the amount of sales over $300.