He has $18 left (sorry im have to type 20 letterssss)
        
                    
             
        
        
        
When it says to estimate, I always think of doing it by hand to show work.  So set it up like this:
   96
<u>x 34</u>
So follow it out multiplying across 4*6 and 4*9 carrying over as needed to get it to look like this:
   96
<u>x 34</u>
384
Do the same for the 3 to get this:
   96
<u>x 34</u>
   384
2880
Add 384+2880=3264
Your final answer is 3,264
 
        
             
        
        
        
Answer:
42(79,42,32)
Step-by-step explanation:
I got the solution by using  the  Trigonometric Identities. If somebody else could do a step by step explanation that would be great.