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quester [9]
3 years ago
13

Please help me. i don't understand

Mathematics
1 answer:
liberstina [14]3 years ago
3 0

Answer:

#9 the answer is 7

Step-by-step explanation:

so start with what you know. the sum of the angles in a triangle equal 180 degrees

so...

(x + 13) + (17x - 7) + 48 = 180

now just combine like terms

18x + 54 = 180

18x = 126

x = 7

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