exam Maths Puzzle Numerical Ability

sqrt (3)/ sqrt (6)-1 - sqrt (3)/ sqrt (6)+ 1

After working it out, I got sqrt (3) - sqrt (3) for my answer. I don't think I did it right. Can you please help?

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How do I grapgh the function that has the following properties: concave up, y-intercept is -6, zeros at x = -2 and x = 3? Lane invested $14000 part at 15% and part at 2%. If the total interest at the end of the year is $1060, how much did she invest at 15%. Please help. What formula could I use?