exam Maths Puzzle Numerical Ability

Can anyone help me with this?

My problem is how to rationalize the denominator:

2/ sqrt[6] - sqrt[5]

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exam Other Question

Write an exponential equation for each of the following, and use it to answer the problem.
a) Katie invests $600 in a GIC which appreciates 12% every 2 years. How much money will Write an equation for each function in the form f(x)= mx+b.

16. f(3)=9, f(5)=15
17. f(-2)=4, f(2)=-16
18. f(0)=5, f(-5)=10
19. f(10)=4, m=1/2