exam Maths Puzzle Numerical Ability

how do you find the y coordinates from the equation f(x)= -4x+2

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exam Other Question

(6-4i) - (3-2i)

(3+i)(2-7i)

4+3i/3-2i
A frisbee is thrown straight up in the air, and its height is measured in metres at intervals of 0.2 seconds. If the resulting data forms a quadratic sequence of the form tn=an^2+b