initial commit / add all books

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diff --git a/1529/CH10/EX10.12/10_12.sce b/1529/CH10/EX10.12/10_12.sce
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+//Chapter 10, Problem 12, figure 10.30

+clc;

+rP1 = 3;            // ratio of two powers

+rP2 = 20;           // ratio of two powers

+rP3 = 400;          // ratio of two powers

+rP4 = 1/20;         // ratio of two powers

+//calculation:

+X1 = 10*log10(3)

+X2 = 10*log10(20)

+X3 = 10*log10(400)

+X4 = 10*log10(1/20)

+

+printf("\n\n (a)decibel power ratio for power ratio 3 = %.2f dB ",X1)

+printf("\n\n (b)decibel power ratio for power ratio 20 = %.1f dB ",X2)

+printf("\n\n (c)decibel power ratio for power ratio 400 = %.1f dB ",X3)

+printf("\n\n (d)decibel power ratio for power ratio 1/20 = %.1f dB ",X4)