Answer:
36 minutes
Step-by-step explanation:
2 hours in minutes is 120
120-84
36 minutes
 
        
             
        
        
        
Her next step is to repeat the last process of drawing those two arcs. However, they will be mirrored since she swapped endpoints. 
Check out the diagram below. Figure 1 is what she already has. Figure 2 is what happens after completing the next step. The red and blue arcs intersect to help form the endpoints of the perpendicular bisector. I used GeoGebra to make the diagrams.
 
        
             
        
        
        
Answer:
log(32/125)
=log32 - log125 [log(x/y)=log(x) - log(y)]
=log(2)^2 - log(5)^3
=2log2-3log5 [log(x)^p=p log x]
=2a-3b
 
        
             
        
        
        
30+6+0.4+0.09+0.005=36.495
        
                    
             
        
        
        
If he charges $145 he worked for 5 hours at $20 an hour