exam Maths Puzzle Numerical Ability

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

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exam Other Question
x^3+x^2 x+4
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x^2-16 3x^4+x^3-2x^2 I do not understand how I turn the square root of (24/25) into (2/5*square root of 6).