exam Maths Puzzle Numerical Ability

What is the domain of

sqrt(8-sqrt(8-x))

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exam Other Question

key works for radio wealth, last week the worked as fallows
monday 4 5/8 hrs
tuesday 7 1/6 hrs
wensday 9 3/4 hrs
thursday 8 1/2 hrs
friday 9 1/2 hrs
for how many hours did key worked last week?
show your sulotion
5 2 8
x y z
------
-3
(xy)