book Maths Puzzle Numerical Ability

Find the axis of symetry (X-coordinate) and vertex of the parabola y = 6 + 6x - 1/3xSQUARED. the x of 1/3x is squared

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I need help with a question, Find the value of y in the equation

3
---- =8
y-2

I think the answer is y= 1 5/8

Am I right, Can someone please let me know? How many three-digit counting numbers are even? How many five-digit counting numbers contain at least one 6?

I had the answer of 400 = 10 x 10 x 4, but I was told that this was