exam Maths Puzzle Numerical Ability

The value of a new $3500 sailboat decreases 10% per year. Find its value after 1 year.

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Could someone please help, I just wanted to verify my answer to this problem:

-(3- 2x^2 / x^2 - 9x+ 20) - (4x^2 + 2x+ 1/ x^2 - 9x + 20) + (2x^2 + 3x/x^2 -9x + 20)

I got:

5 I would appreciate some help with this one.

1.A student writes down the following as part of her response: a ) 32 � 33 = 729. and b) 3 -2 = -9. Are her answers correct? If not,