book Maths Puzzle Numerical Ability

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?

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book Other Question

Write the equation of a hyperbola from the given information. Graph the equation. Place the center of the hyperbola at the orgin of the coordinate plane. One focus is located at (0,6); one vertex at (0,-(square root) 7 How would you translate phrases into algerbraic expressions?
Example: twice a number