1### Demo ###     
21.2 / (3.3 + 1.7)
33M / 6k          
45 % 2            
5
6# Unit conversions 
7a = 1.7ft + 25.3 cm
8a in inches        
93 yards in mm      
10pi * 6cm^2         
111km to mi          
12
13# Currency conversions
1429 CAD to USD         
15100 GBP in $          
16$2000 to btc          
17$6 in nickels         
18
19# Variables                       
20width = 6 feet                    
21length = 30 inches                
22height = 45 cm                    
23width * length * height in gallons
24width * length                    
25
26# Algebra                       
27f = parse('2x + x')             
28f.evaluate({ x: 4 })            
29simplify('x * y * -x / (x ^ 2)')
30derivative("2x^2 + 3x + 4", "x")
31
32# Percentages
3312% of 20    
3440 + 30%     
3520% off 110  
36
37# Functions                
38round(pi, 5)               
39log(10000, 10)             
40sqrt(-4)                   
41sin(90 deg)                
42hyp(a, b) = sqrt(a^2 + b^2)
43hyp(3, 4)                  
44
45# Date calculations    
46today - 3 weeks        
47now + 36 hours - 2 days
48yesterday - 1 year     
49
50ladle = 6 tablespoons
51gravyBoat = 5 ladle  
523 gravyBoat in cups  
53
54hexToChar("D83DDE43")
55charToHex("👾")      
56
57anArray = [[2, 0], [-1, 3]]        
58aMatrix = matrix([[7, 1], [-2, 3]])
59multiply(anArray, aMatrix)         
60aMatrix * 2                        
61
62[2, 3, 4] - 3
63
64add(aMatrix, 2)
65
66det(aMatrix)
67det(anArray)
68