book Maths Puzzle Numerical Ability

the equation x(squared)-2x=0 has two solutions. whats the other?

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Could someone out there help me solve this problem?

A tree casts a shodow that measures 5 m. At the same time, a meter stick casts a shodow that is 0.4 m long. How tall is the tree?

Thank you,
Sher
For the function,

Give the y values for x = -2, -1, 0, 1, 2, 3.
Answer:
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Using these points, draw a curve.
Show graph here.