Answer:
<h2>0</h2>
Step-by-step explanation:

Y=1.50x+7.50. 7.50 is the y intercept and 1.50 is the rate of change or slope
For question between 13 -> 17 replace n with the number.
Example:
13.) n = 2; 2+(-1) = 1
Base in your question the coordinate is P is 2, PQ has a coordinate of 8 while PR has a coordinate of 12. To find the mid point of each segment you must first find the coordinate of QR which is from 8-12. So the answer will be
PQ = 5, PR = 6, and QR= 10