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Sagot :
Answer:
x = 2
ST = 28
Step-by-step explanation:
Since, SM = MT ( from the diagram )
SM = x + 12
MT = 8x - 2
8x - 2 = x + 12
8x - x = 12 + 2
7x = 14
x = 14 / 7
x = 2
ST = SM + MT
= x + 12 + 8x - 2
= x + 8x + 12 - 2
= 9x + 10
= 9 ( 2 ) + 10
= 18 + 10
ST = 28
M is the midpoint of ST thus :
SM = MT
x + 12 = 8x - 2
Add both sides 2
x + 12 + 2 = 8x - 2 + 2
x + 14 = 8x
Subtract both sides x
x - x + 14 = 8x - x
14 = 7x
Divide both sides by 7
7x ÷ 7 = 14 ÷ 7
x = 2
_________________________
ST = SM + MT
ST = x + 12 + 8x - 2
ST = 9x + 10
ST = 9(2) + 10
ST = 18 + 10
ST = 28
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