To solve this problem you must apply the proccedure shown below:
1. You have the following points given in the problem above:

2. To find the midpoint, you must apply the formula that is used for calculate it. This is:

Where:

3. Now, you must substitute these values into the formula for calculate the midpoint, as following:

Therefore, the answer is: 
145 divide by 5 it should equal 29
Answer:
I think it might be B.) Triangle B
Step-by-step explanation:
I think it is $10 for 20%