The correct answer is a = 40.
If this has helped you, consider my answer to become the Brainliest!
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Answer:</h2><h2> x-4y= 8
</h2><h2>I hope it helps :)</h2><h2>
Step-by-step explanation:</h2><h2>

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Awnser ::::::: There are no signs in the problem
Opposite angels are congruent (D = B). Consecutive angles are supplementary (A + D = 180°)
Answer:
9
Step-by-step explanation:
look at the other question I answered for explanation, but to put it plainly:
braniliest
(15+3)/2=9