Answer:

Step-by-step explanation:
The nth term of the sequence is

To get the first term, substitute n=1,

To get the second term, substitute n=2,

To get the third term, substitute n=3,

The sum of the first three terms is

We could also use the formula
to get the same result.
I wrote the steps down, hopefully you understand them and the answer is on the lower right corner.
1. 10 pastries
2. $11
3. 5 miles
4. 0.83 cups
5. 9 pizzas
1. $0.41
2. erik because there is more