book Maths Puzzle Numerical Ability

3x+4=x+9

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If the voltage V is an electric circuit is held constant, the current I is inversely proportional to the resistance R. If the current is 40 amperes when the resistance is 270 ohms, find the current when the resistance is 150 ohms. Find the vertex form of the equation of a parabola with vertex at (-5,-2) and passing through a point P(2,-8)