Exam Maths Puzzle Quadratic Equations

(1+X)/(2X)=9X using a quadratic formula?

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Exam Other Question

Graph
y=x^5/3 - 5x^2/3

Find the area between the curves
a)x=y^3 and y=x^1/2
b)y=-x^2 + 4 and y-x=-8
a train traveled form its terminal to an ocean resort at 90/km/h and then returned at 72km/h. What is the rail distance between the train terminal and the ocean resort if the round trip travel time was 9 hours?