exam Maths Puzzle Numerical Ability

I dont know how to do this; Write an algebraic expression for: two thirds of the square of a number.

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exam Other Question

1. WHAT IS THE EQUATION OF THE DIRECTRIX OF THE PARABOLA WITH EQUATION X=4Y2+16Y+19?

2. WHAT IS THE LENGTH OF THE MAJOR AXIS OF THE ELLIPSE WITH EQUTION 4(x+4)2+9(y-1)2=36?

3 Factoring General Quadratic Trinomial 2x2+x-3 Read 2xsquared plus X minus 3.