(a) \(11+(–7)\)
\(= 11-7\)
\(= 4\)
(b)\( (–13)+(+18)\)
\(= (-13)+18\)
\(= 5\)
(c)\( (–10)+(+19)\)
\(= -10+19\)
\(= 9\)
(d) \((–250)+(+150)\)
\(= -250+150\)
\(= -100\)
(e) \((–380)+(–270)\)
\(= -380-270\)
\(= -650\)
(f) \((–217)+(–100)\)
\(= -217+100\)
\(= -317\)
Complete the drawing shown in Fig. 9.14 to indicate where the free ends of the two wires should be joined to make the bulb glow