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Anna71 [15]
3 years ago
9

Multiple choice!!!!!!!!!!!!!!!!!!

Mathematics
2 answers:
Rainbow [258]3 years ago
8 0

Answer:

x = 21 i took the test

dolphi86 [110]3 years ago
7 0
By the external angle theorem 

5x = (5x - 30) +  m < RST

m < RST  = 5x - 5x + 30  = 30

 also m < STR = m < SRT = 5x - 30

So as there are 180 degrees in a triangle:-

5x - 30 + 5x - 30 + 30 = 180

10x = 180 +30+30-30 = 210

x = 21 answer
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