Question 193674
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Let us see the ladder:
{{{drawing(300,300,-1,10,-1,5,line(0,0,0,4),line(0,4,1.5,4),line(1.5,4,1.5,0),line(1.5,0,0,0),green(line(1.5,4,8,0)),line(8,0,-1,0),red(locate(6.8,.5,70^o)),green(locate(4.3,2.5,ladder=15ft)),green(arrow(1.5,-.3,8,-.3)),red(locate(4,-.5,X)))}}}
By Trigo Function:
{{{Cos(70^o)=adj/hyp=X/15}}}
{{{X=cos(70^o)(15)}}}
{{{red(X=5.13ft)}}}, Answer


Thank you,
Jojo</font>