I NEED 4 5 and 7 please

Answer:
Step-by-step explanation:
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4) 5x+16 because it's a parallelogram and both sides are equal and parallel
5) (4x+3) degrees because, again, it's a parallelogram so alternate angles are congruent
7) 180-10x-8=180
-10x=8
x=-0.8
I'm not 100% sure on the last one, so maybe try that one again just in case.
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Please, please give brainliest, it would be greatly appreciated, I only a few more before I advance, thanks!