We have the following:
In this case, the total value of earnings would be the product of each hour worked (t) by the value of each hour worked ($ 9)
![s=9\cdot t](https://img.qammunity.org/2023/formulas/mathematics/college/uyl32jwx27nhiod8j4649v8otm1xyc0in5.png)
therefore, the answer is:
A.] Let s=9xt where s represent s the amount earned and 9xt represents the product of the rate and time worked.