exam Maths Puzzle Numerical Ability

Please help me solve this problem 9-5(-7x+5)

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please factor as a difference of squares:

m^2-n^2-2m+1 Bob invested $20,000, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%?
A). $11,000

B). $12,000

C). $8,000

D). $13,000