exam Maths Puzzle Numerical Ability

I do not understand how I turn the square root of (24/25) into (2/5*square root of 6).

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exam Other Question

which equation expresses th relationship between x and y for the following coordinates? (-2,4)(-1,2)(0,1)(1,1/2)(2,1/4)

a. y=-1*2^x
b. y=-1*1/2^x
c. y=2^x
d. y=1/2^x Anna has 12 bills in her wallet, some 5$ and some $10. The total value of the bills is $100. How many of each bill does Anna have?