Answer:
If you connect A to E to D to C to B to A again it is a polygon. A to E to B to a again is also a polygon. D to E to B to C to E again is a polygon. A to E to C to B to A again is a polygon.
Step-by-step explanation:
Answer:lol
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f(-1) = 7
Put -1 where x is and do the arithmetic.
f(-1) = 2(-1) +9 = 7