book Maths Puzzle Numerical Ability

in solving the equation log6(x-5)+log6(x-6)=1 a student correctly arrives at a step where x=8 or x=3. when these two values of x are verified?

a.neither
b.both
c.only x=3
d.only x=8

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book Other Question

Suppose you have $350.62 to spend on a remodeling project. The floor tiles and curtains cost $180. Determine the amount of paint you can buy, in gallons, if the paint costs $13.50 per gallon. Graph each quadratic function and state its domain and range.
h(x) = -3x^2