please help me. yg di linkarin

1. sin30°+cos90°-tan45°
>1/2+0-1
>1/2-1/1
= -1/2

2. <B= 180°-(60°+90°)
=180°-150°
>30°
AB= AB/sinC= AC/sinB
=AB/1=8/1/2
AB.1/2=8
> AB= 16
BC=AB/sinC=BC/sinA
=16/1=BC/1/2√3
BC=16.1/2√3
=13.8
panjang ss sgtga abc=13.8+16+8
37.8