Just subsitute 8 for n
1/2(8)^2-1/2(8)
1/2(64)-4
32-4
28
D
Answer:

Step-by-step explanation:
Everything is distributed evenly on both ends.
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The answer is x<2
-2x^5 + 14x^4 - 36x^3 + 52x^2 - 64x + 48=0
Answer:
it is 7squere meters
Step-by-step explanation: