A ladder 14 feet long is leaning against a wall that is perpendicular to level ground. The bottom of the ladder is 5 feet from the base of the wall. If the top of the ladder slips down 4 feet, how many feet will the bottom of the ladder slip?
Choices.
A) 4  B) 5  C) 8  D) 10.72  E) 15
14^2-5^2=171   it means that the height is equal to 13.07~=13.   since the top of the ladder slips down 4 feet, then the height of the wall =13-4= 
<gadget id="calculator">13-4</gadget>
<output>9</output>
9   the bottom=sqrt(14^2-9^2)=sqrt(196-81)=10.72   ans is 10.72
<result>D</result>
A ladder 14 feet long is leaning against a wall that is perpendicular to level ground. The bottom of the ladder is 5 feet from the base of the wall. If the top of the ladder slips down 4 feet, how many feet will the bottom of the ladder slip?