A ladder 30 feet long is leaning against a wall that is perpendicular to level ground. The bottom of the ladder is 10 feet from the base of the wall. If the top of the ladder slips down 5 feet, how many feet will the bottom of the ladder slip? Choose the most appropriate option:
A) 14  B) 15  C) 18.92  D) 19  E) 25
30^2-10^2=800   it means that the height is equal to 28.28.   since the top of the ladder slips down 5 feet, then the height of the wall =28.28-5= 
<gadget id="calculator">28.28-5</gadget>
<output>23.28</output>
23.28   the bottom=sqrt(30^2-23.28^2)=sqrt(900-541.95)=18.92   ans is 18.92
<result>C</result>
A ladder 30 feet long is leaning against a wall that is perpendicular to level ground. The bottom of the ladder is 10 feet from the base of the wall. If the top of the ladder slips down 5 feet, how many feet will the bottom of the ladder slip?