exam Maths Puzzle Numerical Ability

Rewrite the equation 4x-6y=-30 as a function of x.

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exam Other Question

Im not sure if this is what i need but i would like to know how do i do this problem? I relly need help. Solve for h
V=((Pi/3)(r^2)(h))
how do i solve for h
I don't know what to use for the Pi Symbol