exam Maths Puzzle Numerical Ability

Please help me :)
Solve for "x":
a) logbasex 4=2 (I think it is x=+-2 or is it just x=2???)
b) logbase9 x=-1/2 ( I think it is x=3 ???)
c) 64(^x-2)=16^1/3

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exam Other Question

Solve for x:
a)5x^1/2=20
b)8x^-3=64
c)8(x-2)^3=27
d)(x+3)^sqrt2=25^sqrt8
find the sum on a number line -42+10