book Maths Puzzle Numerical Ability

TELL WEATHER THE RELATIONSHIP BETWEEN X AND Y IS LINEAR,EXPONENTIAL,OR NEITHER AND EXPLAIN THE ANSWER- X-0,1,2,3,4,5 -Y-1,1/4,1/16,1/64,1/256,1/1024 ?

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book Other Question

How many gallons of pure antifreeze must be added to 20 gallons of 25% antifreeze to get a mixture that is 40% antifreeze I need to evalute the expression:

y^4/9(y^-4/9 + 4y ^5/9)

any help with this,i cant make sense of it or solve it. I need to multiply and assume all numbers are positive.

Thanks for your help