book Maths Puzzle Numerical Ability

How would you translate phrases into algerbraic expressions?
Example: twice a number

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book Other Question

Suppose that a ball is dropped from a height of 30ft and that each bounce reaches to 3/8 of the previous height. How high will the ball bounce on the second bounce? It has been many years since I have been in algebra. I need a quick help on how to Graph the quadratic equations using the vertex and the roots of the equations.

y=x(2)-x-6