exam Maths Puzzle Numerical Ability

Multiply.

(x - 10)(x + 9)

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exam Other Question

In Problem 10, what will be the balance owed by White's Photography after payment of $1500 on March 4? (ignore payments mentioned in Problem 10.) Can you help me with this problem, i came up with two different answers.
2 over 5w+10 - 3 over 2w-4. I came up with 3/5 and 3/1 by figuring it two differnt ways. Would you please show me the correct way of working this problem. Thank you.