initial commit / add all books

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diff --git a/2510/CH27/EX27.12/Ex27_12.sce b/2510/CH27/EX27.12/Ex27_12.sce
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+//Variable declaration:
+TH = 500                        //Hot stream temperature at exchanger 1 ( F)
+tc = 100                        //Cold stream temperature at exchanger 2 ( F)
+A = 10                          //Constant A
+B1 = 100000                     //Constant B1
+B2 = 4000                       //Constant B2
+B3 = 400000                     //Constant B3
+
+//Calculations:
+//It forms equation fo form t^2 - t(Th-tc) +tcTH +B/A
+t1 = roots([1, -(TH+tc),(tc*TH + B1/A) ]); //Roots
+tmax1 = TH - sqrt(B1/A)         //Upon maximising profit
+t2 = roots([1, -(TH+tc),(tc*TH + B2/A) ]); //Roots
+tmax2 = TH - sqrt(B2/A)         //Upon maximising profit
+t3 = roots([1, -(TH+tc),(tc*TH + B3/A) ]); //Roots
+tmax3 = TH - sqrt(B3/A)         //Upon maximising profit
+
+//Results:
+printf("tBE for case 1: %.0f F %.0f F",t1(1),t1(2))
+printf("tmax1: %.0f F",tmax1)
+printf("tBE for case 2: %.0f F %.0f F",t2(1),t2(2))
+printf("tmax1: %.0f F",tmax2)
+printf("tBE for case 1: %.0f F %.0f F",t3(1),t3(2))
+printf("tmax1 : %.0f F",tmax3)