exam Maths Puzzle Numerical Ability

solve 4A/3=1/2b^2c^2d for c

thank you

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exam Other Question

I have to graph this equation on a grid. I know how to graph it, I just don't know how to do the equation.

Here is an example of what my teacher gave me. plug -2 in for x.
2x= i do not understand this show me please?
(2r-3s)(4r^2+6rs+9s^2)