exam Maths Puzzle Numerical Ability

Find the exact value of sin 165�.

Thank You

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exam Other Question

Find all positive values for k for which each of the following can be factored.

x^2 + x - k

I am having trouble with this problem and need some help. Thanks. SOLVE THE SYSTEMS USING THE GAUSS-JORDAN METHOD

THIS IS MY PROBLEM: x-2y= -1
2x+y= -7

I KNOW HOW TO FIRST SET IT UP BUT FROM THERE IT IS ALL DOWN HILL..