exam Maths Puzzle Numerical Ability

Multiply. (x- 10)(x + 9)

I tried to do this one and ended up with the same equation. I am not sure how. Please help.
Thanks.

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exam Other Question

Are the ordered pairs a solution of 4x+6y greater than or = to 48

ordered pairs::: (5,5), (10,-2), (-2,10), (6,4)
How do I do this again. Please help?Please.
Solve.

x/7-1/2= x-11/2