Arthur D. answered 08/25/15
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the ladder, the ground, and the wall form a right triangle
the ladder is the hypotenuse
use the sine function
sin=opp/hyp
sin(75º)=w/24
sin(75º)*24=w, which represents how high up the wall the ladder goes
use a calculator to find sin(75º) or use a table or use the web
sin(75º)=0.96592582628
0.9659258*24=23.18 feet approx.