exam Maths Puzzle Numerical Ability

Find the maximum value of y=-x^2+6x. I worked it out to be 10 but not to sure about that. thanks for any help given.

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exam Other Question

If the quotient of three times a number and five is increased by four, the result is 34. Find the number.
This problem was on a work sheet, but I believe it is in chapter 1 Please help me simplify this expression:

the square root of x^2