exam Maths Puzzle Numerical Ability

How do I solve: (square root -6) - (square root -2)?

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exam Other Question

Solve each of the following systems by graphing

2x - y = 4 and 2x - y = 6 Value of car 2 yrs after it was bought = 14300, 4 yrs = 10200, what is depreciation rate? Is 2050 right and how do you find the yrs it will take to reach 0 value. I tried but now I am stuck. Please help if you will, and thanks again for the help!!!