3 years ago

Please help me answer this question!!!

Mathematics

1 answer:

boyakko [2]3 years ago

8 0

Answer:

Step-by-step explanation:

<STR = <SRT Given the markings of the triangle

<STR + <STU = 180 Supplementary angles

(2x - 9) + 7x = 180 Remove the brackets

2x - 9 + 7x = 180 Combine

9x - 9 = 180 Add 9 to both sides

9x = 180 + 9 Combine

9x = 189 Divide by 9

9x/9 = 189/9

x = 21

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