exam Maths Puzzle Numerical Ability

Solve this system of equations by graphing:
x � 2y = -2
x + 2y = 6

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exam Other Question

3y sqrt 4y^2- sqrt 16y^4+ sqrt18y^3 =3 sqrt2-4y sqrt3

I think I got this one right!!! I need help with surface areas.
I have a piece of cheese where A=24 B=45 C=6.9 D=51
Rectangle is A=68 B=39 C=51
Cylinder is A=24 B=10 B is Height
I have no clue and cant figur