A student estimated that it would take 4 hours to write a book report, but it actually took her 8 hours. What is the percent error for her estimate?

answer:   2 multiplied by x =24

step-by-step explanation:

step by step solution :

step   1   :

1.1     4 = 22

(4)3 = (22)3 = 26

equation at the end of step   1   :

  ((23) • 26)2

step   2   :

equation at the end of step   2   :

  (23 • 26)2

step   3   :

final result :

  218

ya

pi or 3.14159265359 is an irratinal decimal