It's an irrational number, so you can get as close as you need to, but
you can't write it exactly with numbers. As a decimal, it never ends.
-- The number <em>5.4175</em> is within 0.00003% of the actual value.
-- (5.4175)³ is less than 0.000084% smaller than 159 .
12.25=2.5+13x
12.25-2.5=9.75
9.75/13=.75
Louisa paid 75¢ for every soft cover book.