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diff --git a/317/CH9/EX9.1/example1.sce b/317/CH9/EX9.1/example1.sce
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+// find the value of capacitance
+// Electronic Principles
+// By Albert Malvino , David Bates
+// Seventh Edition
+// The McGraw-Hill Companies
+// Example 9-1, page 289
+
+clear;clc; close;
+
+// Given data
+R=2*10^3;// resistance in ohms
+fmin=20;// lower frequency range
+fmax=20*10^3;// higher frequency range
+
+// Calculations
+Xc=200;// Xc<0.1*R at 20 Hertz
+C=1/(2*%pi*fmin*Xc);// in faraday 
+disp("Faraday",C,"Capacitance=")
+
+// Result
+// Capacitance required is 39.8 micro Faraday
diff --git a/317/CH9/EX9.1/example1.txt b/317/CH9/EX9.1/example1.txt
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+Capacitance required is 39.8 micro Faraday
diff --git a/317/CH9/EX9.2/example2.sce b/317/CH9/EX9.2/example2.sce
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+// find the value of capacitance
+// Electronic Principles
+// By Albert Malvino , David Bates
+// Seventh Edition
+// The McGraw-Hill Companies
+// Example 9-2, page 293
+
+clear;clc; close;
+
+// Given data
+R1=600;// resistance in ohms
+R2=1*10^3;// resistance in ohms
+R=(R1*R2)/(R1+R2);// R=R1||R2
+f=1*10^3;// frequency in hertz
+
+// Calculations
+Xc=37.5;// Xc<0.1*R at 1000 Hertz
+C=1/(2*%pi*f*Xc);// in faraday 
+disp("Faraday",C,"Capacitance=")
+
+// Result
+// Capacitance required is 4.2 micro Faraday
diff --git a/317/CH9/EX9.2/example2.txt b/317/CH9/EX9.2/example2.txt
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+Capacitance required is 4.2 micro Faraday
diff --git a/317/CH9/EX9.3/example3.sce b/317/CH9/EX9.3/example3.sce
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+// find maximum small signal emitter current 
+// Electronic Principles
+// By Albert Malvino , David Bates
+// Seventh Edition
+// The McGraw-Hill Companies
+// Example 9-3, page 297
+
+clear;clc; close;
+
+// Given data
+Vee=2;// in volts
+Vbe=0.7;// in volts
+Re=1*10^3;// in ohms
+
+// Calculations
+Ieq=(Vee-Vbe)/Re;// Q point emitter current in amperes
+ieppmax=0.1*Ieq;// maximum small signal emitter current in amperes
+disp(ieppmax,"maximum small signal emitter current")
+
+// Result
+// Maximum small signal emitter current is 130 microApp.
diff --git a/317/CH9/EX9.3/example3.txt b/317/CH9/EX9.3/example3.txt
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+Maximum small signal emitter current is 130 microApp
diff --git a/317/CH9/EX9.4/example4.sce b/317/CH9/EX9.4/example4.sce
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+// find re(ac)
+// Electronic Principles
+// By Albert Malvino , David Bates
+// Seventh Edition
+// The McGraw-Hill Companies
+// Example 9-4, page 301
+
+clear;clc; close;
+
+// Given data
+Ie=3*10^-3;// emitter current in amperes
+
+// Calculations
+re=25*10^-3/Ie;// ac emitter resistance in ohms
+disp("Ohms",re,"re(ac)=")
+
+// Result
+// re(ac) of the base-biased amplifier is 8.33 ohms
diff --git a/317/CH9/EX9.4/example4.txt b/317/CH9/EX9.4/example4.txt
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+re of the base-biased amplifier is 8.33 ohms
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diff --git a/317/CH9/EX9.5/example5.sce b/317/CH9/EX9.5/example5.sce
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+// find re(ac)

+// Electronic Principles

+// By Albert Malvino , David Bates

+// Seventh Edition

+// The McGraw-Hill Companies

+// Example 9-5, page 301

+

+clear;clc; close;

+

+// Given data

+Ie=1.1*10^-3;// emitter current in amperes

+

+// Calculations

+re=25*10^-3/Ie;// ac emitter resistance in ohms

+disp("Ohms",re,"re(ac)=")

+

+// Result

+// re(ac) of the base-biased amplifier is 22.7 ohms

diff --git a/317/CH9/EX9.5/example5.txt b/317/CH9/EX9.5/example5.txt
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+re of the base-biased amplifier is 22.7 ohms
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diff --git a/317/CH9/EX9.6/example6.sce b/317/CH9/EX9.6/example6.sce
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+// find re(ac) 

+// Electronic Principles

+// By Albert Malvino , David Bates

+// Seventh Edition

+// The McGraw-Hill Companies

+// Example 9-6, page 301

+

+clear;clc; close;

+

+// Given data

+Ie=1.3*10^-3;// emitter current in amperes

+

+// Calculations

+re=25*10^-3/Ie;// ac emitter resistance in ohms

+disp("Ohms",re,"re(ac)=")

+

+// Result

+// re(ac) of the base-biased amplifier is 19.2 ohms

diff --git a/317/CH9/EX9.6/example6.txt b/317/CH9/EX9.6/example6.txt
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+re of the base-biased amplifier is 19.2 ohms
\ No newline at end of file