Question: Lindy works at a pizza restaurant and gets a 10% employee discount. She knows that if she orders $d$ drinks and a medium pizza with $t$ toppings, her total cost can be found using this expression:
$$0.90(2.25d + 1.40t + 6)$$
What is the total cost for Lindy and her friends to order 4 drinks and a medium pizza with 3 toppings?
1. **State the problem:** We need to find the total cost for Lindy ordering 4 drinks ($d=4$) and a medium pizza with 3 toppings ($t=3$) using the given formula.
2. **Write the formula:** The total cost is given by:
$$0.90(2.25d + 1.40t + 6)$$
3. **Substitute the values:** Replace $d$ with 4 and $t$ with 3:
$$0.90(2.25 \times 4 + 1.40 \times 3 + 6)$$
4. **Calculate inside the parentheses:**
$$2.25 \times 4 = 9$$
$$1.40 \times 3 = 4.20$$
So,
$$0.90(9 + 4.20 + 6)$$
5. **Add the terms inside the parentheses:**
$$9 + 4.20 + 6 = 19.20$$
6. **Multiply by 0.90:**
$$0.90 \times 19.20 = 17.28$$
7. **Final answer:** The total cost is $17.28$.
**Note:** The answer options given are $16.52$, $28.40$, $15.69$, and $17.28$. The correct total cost is $17.28$.