book Maths Puzzle Numerical Ability

7+7x7-7 divided by=
(the answers are.....13, 55, 7, or none of these)

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book Other Question

Without drawing a graph how can I determine (a) how many x-intercepts the parabola has (b) whether its vertex is above, below or on the x- axis?

y = -x^2 + 2x-1 What is the domain, range, and zeroes of f(x)=x^2-6x=4