If p is the midpoint of qr, find the length of qr. a. 37 b. 38 c. 40 d. 43

Midpoint means that the line segments beside the midpoint are same legnth
therefor QP=PR in legnth
therefor
2x-6=x+7
solve
remember thath you can do antyhingn to an equaiton as long as you do it to both sides

2x-6=x+7
minus x from both sides
2x-x-6=x-x+7
x-6=0+7
add 6 to both sides
x+6-6=7+6
x=13
qr=pr
pr=x+7
x+7=13+7=20

answer is 20 units