Answer:
If you are provided with the lengths of two sides a triangle, you can find the third side using the Pythagorean Theorem:
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Variable c represents the length of the hypotenuse, and variables a and b represent the lengths of the other two sides.
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Answer:
Step-by-step explanation:

(x + 7)° = (15 + 7)° = 22°
(4x + 8)° = (4*15 + 8)° = (60 + 8)° = 68°
1,-7 would be the answer I believe
Do the vertical line test
16. Function
17. Not
18. Not
19. Function