The wire at $(x,y)=(-17\mathrm{.}5cm,0)$ carries current $I_1=2\mathrm{.}00A$ in the negative$-z$ direction. The wire at $(x,y)=(17\mathrm{.}5cm,0)$ carries current $I_2=1\mathrm{.}50A$ in the positive$-z$ direction. The wire at $(x,y)=(0,30\mathrm{.}3cm)$ carries current $I_3=7\mathrm{.}00A$ in the positive$-z$ direction. The wires are equally spaced by a distance $d=35\mathrm{.}0cm.$