exam Maths Puzzle Numerical Ability

Hi. Can I have some help with functions?

Evaluate the function at the indicated values.

h(t)=t+1/t;

h(1),h(-1),h(2),h(1/2),h(x),h(1/x)

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exam Other Question

4√1/2 + 2√18 -6√2/9

Please step-by-step explain process.
How many solutions are there to the system
x - 4y = 2
x-4y = 7