Answer:
MB = 21
Step-by-step explanation:
M is midpoint of AB, therefore AM = MB
AB = 4x + 13
MB = 2x + 17
Solving:
4x + 13 = 2x + 17
4x - 2x = 17 - 13
2x = 4
x = 2
Replacing 2 in 2x + 17 to obtain MB:
MB = 2(2) + 17 = 21
