Answer: OPTION D.
Explanation:
You know that Lindy's total cost can be found using this expression provided in the exercise:
![0.90(2.25d + 1.40t + 6)](https://img.qammunity.org/2020/formulas/mathematics/high-school/h3l7clwa1a1j9wjfv0usooe2lv9lma9f88.png)
Where "d" is the number of drinks she orders and "t" is the number of toppings for a medium pizza she orders.
Since she and her friends to order 4 drinks and a medium pizza with 3 toppings, you can find the total cost by substitute values into the given expression.
The values are:
![d=4\\\\t=3](https://img.qammunity.org/2020/formulas/mathematics/high-school/853qquvly4qric3iuu348xc61391i2iyjg.png)
Substituting into the expression and evaluating, you get:
![0.90(2.25d + 1.40t + 6)= 0.90(2.25(4) + 1.40(3) + 6)=\$17.28](https://img.qammunity.org/2020/formulas/mathematics/high-school/b3b8nwz67k10fluz3umr485fg7ai25znpw.png)