exam Maths Puzzle Numerical Ability

Can you help me with rationalizing the denominator on the following: 2/(sqrt2 -1). I deeply appreciate your help..:)

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exam Other Question

I need help with this homework question: find the polynomial written as a product of linear factors. f(x)=x^4-15x^2+10x+24 David has collected $6.50 in nickels and dimes. If he has 75 coins, how many of each kind of coin does he have?