book Maths Puzzle Numerical Ability

2. Multiply and simplify: x^2-x-20 * x^2+7x+10
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x^2-3x-105 x^2+4x-5

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book Other Question

F(4)=450log3(5t+7) please solve help class in 3 hours cant solve Hi will you please explain to me how to determine whether each relation is linear. Here is one problem:

y=-4