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Indicate which answer is a simplification.

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Part 1:
1. B
Since a/b=c/d, then d=bc/a=3.2*3/2.8=3.43
2. C
3. D
Since D^3-1=(D-1)(D^2+D+1), then (D^3-1)/(D-1)=D^2+D+1. No answer in A,B,C is correct.
4. C
5. D
Simply plug in and you can see only D satisfies all the three equations. This is the Fundamental Mathematics Theorem.
6. B
The distance is 10/sin(30 degree)=10/(1/2)=20
7. A
A polynomial of degree n always has n roots, not necessariy ...