book Maths Puzzle Numerical Ability

A parabola y=ax^2+bx=c has a vertex (5,-3). If (6,0) is on the parabola,
then a+b+c=

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book Other Question

explain why funtion y=x square has no inverse,suggest how many inverses can you define for it? sketch all of them A basket contains 5 apples. Do you know how to divide them to 5 kids so that each has one apple and one apple stays in the basket?