Please help, thank you.

The question is in the picture

X=16

Because total interior angle of heotagon is 900

x = 141°

Step-by-step explanation:

The sum of all the seven angles together would be equivalent to 900°, so I took all the numbers and added it together, receiving 759. I took 759 and subtracted it from 900°, receiving 141°. So the x angle is equivalent to 141°.

Because all heptagons are equivalent to 900°,  that is how I knew what the sum of all the angles would be equivalent to.

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take good notes.

do your homework.

use mnemonics and other tricks.

do practice tests.

note: the best i know.