Answer: 1
Work: After plugging in the 6 in the X, the new equation is -2(6) + 13. After doing the multiplication of -2 and 6, you get -12. Add -12 + 13, and the answer (Or y) equals 1.
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It's C the missing side is 9 units long so since cosine is adjacent divided by hypotenuse it would be 9/41
D. 53, 107
The pattern is multiplying the previous number by two and then adding one to it.