book Maths Puzzle Numerical Ability

Help!!!

^3(((16a^5)))
_____
b^12

All in square root symbol except fo the 3. The line is under the 16a^5

I hope I explained it ok.

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book Other Question

If i was to graph this system of linear inequalities, how will it look on a graph? y≥x and y≥-x/2+1? 3. If a boat goes downstream 72 miles in 3 hours and upstream 60 miles in 6 hours, the rate of the river and the rate of the boat in still water respectively are ________?
a. 7 &1