exam Maths Puzzle Numerical Ability

This expression has gotten me down.

Directions are: Write the expression in terms of logarithms of x and y:

log 5^x2/y ( the y is under a square root symbol)

Thanks f

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exam Other Question

a taxicab ride that is 2 miles long cost $7. One that is 9 miles long cost $24.50. Write an equation relating cost to length of ride. Why does y=3 represent a function, but x=3 does not?