ANSWER
$ 333
EXPLANATION
The revenue you earn is modeled by the function,
![R(t) = - 2 {t}^(2) + 87t + 90](https://img.qammunity.org/2020/formulas/mathematics/high-school/doanchugkue172hen3k73z82eoyd5o6eqq.png)
where t is the number of weeks.
In your third week of business, we want to find how much dollars you will make.
So we plug t=3, into your revenue function to obtain;
![R(3) = - 2 {(3)}^(2) + 87(3)+ 90](https://img.qammunity.org/2020/formulas/mathematics/high-school/nvf80ml1fe34puh1m8r32owzjcg14cj6zy.png)
![R(3) = - 18+261+ 90](https://img.qammunity.org/2020/formulas/mathematics/high-school/sqt3dpau91uhh9en1ks9pznm28qb56eykz.png)
![R(3) = 333](https://img.qammunity.org/2020/formulas/mathematics/high-school/uwbfbpidmqify7rk60iacyatyyb0bl1uvl.png)
Hence in the third week, you will make, 333 dollars