Answer:
103
Step-by-step explanation:
6 sides
(6-2)180 =720
720 = S×T+U+V+W+X
S=90
720 = 90 + (9X-19) + (111) + (5X+8) + (128) + (7X+3)
COMBINE LIKE TERMS
720= (90-19+111+8+128+3) + (9X+5X+7X)
720 = 321 + 21X
720-321 = 321-321 + 21X
399 = 21X
19 = X
mV = 5X + 8
mV = 5(19) + 8
mV = 95 + 8
mV = 103
