exam Maths Puzzle Numerical Ability

Solve:
a)t=5*logbase4 16
b)t=4*logbase1/3 3sqrt243
c)logbase5 sqrt(2x^2-3)=3/2 I hope I have managed to type these the proper way,if not can someone please let me know :)

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exam Other Question

y=3/2x+3 what is the scientific notation for 135,000?