1) Let x be the original speed that he was driving; 
x mph ---> 1.5 hours 
x+44 mph --> 2.5 hours 
1.5x + 2.5(x+44)=206 
1.5x+2.5x+110=206 
4x=206-110 
4x=96 
x=24 
Therefore, he was travelling at 24 mph in the fog. 
2) Let x be the speed of 1 snail, 
The other snail travels at the speed of x+1 cm/min 
23x+23(x+1)=391 <-- solve for x 
23x+23x+23=391 
46x=368 
x=368/46 
x=8 
Therefore one of the snail travels at 8 cm/min while the other goes at 9 cm/min 
7) Let x be one crew 
Then the other crew would be working at x+0.5 
3.2x+3.2(x0.5)=8 <-- solve for x 
3.2x+1.6x=8 
4.8x=8 
x=8/4.8 
x=1.6666 or 1.7 miles 
Therefore, one of the crew does 1.7 miles per day and the other crew does (0.5*1.7)=0.85 miles
Hope I helped :) 
        
             
        
        
        
Answer: y = x + 4
Step-by-step explanation:
Since the total number of gasoline is given to be "y", with an initial quantity of filled gasoline to be "4" and the quantity of unfilled gasoline to be "x".
Therefore, the summation of the filled and unfilled quantity of gasoline will be "x + 4" which is equal to the total capacity of the tank "y".
 
        
                    
             
        
        
        
Answer:
128
Step-by-step explanation:
180 - 52
 
        
             
        
        
        
Answer: Pretty sure it's A
Step-by-step explanation: If you find the square root of 282 you get 16.7