MATH 081 Exam 1 Review Solutions

1.	

     -3x           -3x               
       =     
            -17          -17
              =      -18 

2.	 
-7            -7

3.	  
                                                          +7     +7

4.	
                                                        -8         -8
                                                               
5.	
6.	
7.	
8.	Since  is undefined,  is undefined.
9.	
10.	
11.	 (or )
12.	
13.	
14.	The difference of -5 and -25 is equal to 20:  
15.	The product of -2 and -46 is equal to 92:  
16.	The quotient of -48 and 12 is equal to -4:   (or )
17.	Let x be the number.  

18.	Let x be the number.  Then.  Dividing both sides by 12 gives

19.	Nine decreased by some number yields the quotient of 10 and 2.  Find the number.
Let x be the number.  Then 
20.	 
21.	which is undefined
22.	 
23.	
24.	
25.	
26.	
27.	Perimeter  cm
(Don’t forget the units!)
28.	12 less than the product of 2 and a number:  
29.	The quotient of a number and 4 more than the number:   or 
30.	Area square inches 
(Don’t forget the units!)
31.	
32.	

33.	
34.	Let x be the number of blue marbles he has.  Then 2x is the number of red marbles he has.  So
.  So Bobby has 16 blue marbles.

35.	Let x be the number of adults.  Then the number of children is x+148.  So
.  There are 126 adults watching the movie.  

36.	Let x be the number.  Then 

37.	Let x be the number of hours of tutoring that Fred received. Then 
  Fred received 28 hours of tutoring.

38.	Let x be the number of gallons of water that the second tank holds.  Then the first tank holds  gallons of water.  So .  So the first tank holds  gallons, and the second tank holds 12 gallons.