exam Maths Puzzle Numerical Ability

Solve:
a) 2logbase6 x - logbase6 4=logbase6(x-1)
b) 3(^2x+1) -28(3)^x)+9=0
c) 4(^1-x)=3*5^x

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exam Other Question

solve the nonlinear system

y-x^2 =-1
2y-3x =0
I have two problems i am unable to do can you help.
thanks
Problem 1 Graph the inequality.
y >=3x

Problem 2
Graph the inequality.
2x + 3y > 6