book Maths Puzzle Numerical Ability

how do i find this? whats the answer? evaluate -4 2
3 6

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book Other Question

The cross section of a large telescope having a diameter of 520 feet and a maximum depth of 55 feet. What is the equation of the parabola?

A){{{y=11/52)x^2}}}x^2

B){{{
What is the vertex of y=x2-4+2
What is the discrimint