book Maths Puzzle Numerical Ability

i need 81^7/4 power simplified

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book Other Question

which of the following is an arithmatic sequence?
a)-2,1,4,7,10,.....
b)5,0,-1,-3,-7,.....c)2,3,5,7,11,13,17,.....
d).35,.5,.85,1.1,1.22,..... 100x^4-16y^4