Solve for x. I NEED HELP ASAP!

Mathematics

1 answer:

galina1969 [7]3 years ago

6 0

Answer:

x = 105

Step-by-step explanation:

The sum of the interior angles of a polygon is

sum = 180° (n - 2) ← n is the number of sides

Here n = 7, thus

sum = 180° × 5 = 900°

Sum the interior angles and equate to 900

x + 102 + 165 + 123 + x + 11 + 128 + 161 = 900, that is

2x + 690 = 900 ( subtract 690 from both sides )

2x = 210 ( divide both sides by 2 )

x = 105

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