exam Maths Puzzle Numerical Ability

x=1 y=3
x=2 y=9
x=3 y=27
x=4 y=81

find a formula relating x and y

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exam Other Question

Please someone help me to solve this radical and simplify the expression

6-20/2. 20 is under the radical sign and the entire 6-20 is over 2. Can someone help me with this problem?

I need to evaluate:
|4| + | -3|

Thanks,
Sher