please help! answer and explanation please!

Answer:
2.15d+3.12 = 11.72
Step-by-step explanation:
The total cost is found by adding the costs of the donuts and the cost of the drink
The donuts cost 2.15 per donut = 2.15d
The drink is 3.12
She spent 11.72
2.15d+3.12 = 11.72
Answer: 4 dounts
Step-by-step explanation:
2.15d + 3.12 = 11.72
- 3.12 -3.12
2.15d = 8.6
8.6/2.15 = 4
That's how you get 4 donuts. Please mark brainliest.