I need full answers with all steps for this Problem $1$:

Select a single$-$angle equal legs tension member to resist a design load of $).$ The member is to be $20$ ft $.$ long, assume an end connection consisting of $(3)-3/4-$in bolts, $3-$in on center as shown in the Figure. Design a $3\frac{1}{2}$ X $3\frac{1}{2}$ in$.$ size angle $($L $3\frac{1}{2}$ X $3\frac{1}{2}$ X $?)$ tension member using AISC$-$LRFD specifications and A $36$ steel with $Fy=36$ksi.

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