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diff --git a/104/CH4/EX4.4/4_4.sce b/104/CH4/EX4.4/4_4.sce
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+//mass-spring system
+//free body diagram and state diagram are drawn as shown in figure 4-18(b) and 4-18(c)
+//applying gain formula to state diagram
+syms K M B
+s=%s
+M1=(1/M)*(s^-2)
+L11=-(B/M)*(s^-1)
+L21=-(K/M)*(s^-2)
+delta=1-(L11+L21)
+delta1=1
+x=M1*delta1/delta
+disp(x,"Y(s)/F(s)=")
+\ No newline at end of file