Answer:
Look in explanation.
Step-by-step explanation:
1. 
is the same as 
because since there is a negative exponent, you would want to flip the reciprocal and change the negative to positive.
The rest are very similar to this.
Supposing 2x-7 were a factor, then 7/2 would be a root. Use synth. div. to determine whether 7/2 actually is a root:
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7/2 / 6 -21 -4 24 -35
21 0 -14 35
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6 0 -4 10 0
Since the remainder is zero, 7/2 is a root and 2x - 7 is a factor.
You could check out the other possible factors in the same manner.
Multiply the original amount by .79 and this will give you the amount with a 21% discount.
