exam Maths Puzzle Numerical Ability

Solve for "x" in each of the following logarithmic equations.
a) x=logbase6 9 + logbase6 8 - logbase6 2
b) x=logbase8 sqrt80 - logbase8 sqrt5

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exam Other Question

Solve by elimination:

2x+3y=21
5x-2y=-14
Using this equation: state tax =.06(300,000- federal tax) and federal tax=.40(300,000-state tax)

how on earth is this solved?