1.  48 + 25 + 22
  = 48 + 22 + 25     (Commutative Prop. of Add.)
  =    70       + 25
  =  95
2.  15(-7)(4)
  = 15(4)(-7)          (Commutative Prop. of Mult.)
  =   60(-7)
  =  -420
3.  5.9 + 10.4 + 2.1
 =  5.9 + 2.1 + 10.4   (Commutative Prop. of Add.)
 =       8.0     + 10.4
 =   18.4
4.  36 ∙ 1 + 0
 =   36   + 0     (Identity Prop. of Mult.)
 =   36             (Identity Prop. of Add.)

5.  Commutative Prop. of Mult.
6.  Identity Prop. of Add.
7.  Commutative Prop. of Add.
8.  Associative Prop. of Mult.

9.  37 yd. ∙ 3 ft. =  111 ft.
                    yd.
10.     7(8 – 3)
     =  56 – 21
     = 35
11.     (4 + 6)(-6)
     =  -24 – 36
     =  -60
12.     5(309)
     = 5(300 + 9)
     = 1500 + 45
     = 1545
13.     8(4.95)
      = 8(4 + 0.9 + 0.05)
      = 32 + 7.2 + 0.4
      =    39.2    + 0.4
      =    39.6
14.     A = l ∙ w
              = (x + 3)5
              = 5x + 15   units²
15.     A = l ∙ w
              = (4a + 5)6
              = 24a + 30   units²
16.     A = ½ ∙ b ∙ h
              = ½ ∙(8)(7 – c)
              =      4(7 – c)
              = 28 – 4c   units²
17.      A = ½ ∙ b ∙ h
              = ½ ∙(2n + 10)(12)
              = ½ ∙(12)(2n + 10)
              =     6(2n + 10)
              =  12n + 60   units²

18.  4x + 2 + 5x

terms:  4x, 2, 5x
like terms:  4x, 5x
coefficients:  4, 5
constant terms:  2
SIMPLIFIED:  9x + 2

19.  –a + 3a + 7 - 4

terms:  -a, 3a, 7, -4
like terms:  -a, 3a;  7, -4
coefficients:  -1, 3
constant terms:  7, -4
SIMPLIFIED:  2a + 3

20.  8k – 5 – 2k + 1

terms:  8k, -5, -2k, 1
like terms:  8k, -2k;  -5, 1
coefficients:  8, -2
constant terms:-5, 1
SIMPLIFIED:  6k – 4

21.  y + 7y – 9 – 3y

terms:  y, 7y, -9, -3y
like terms:  y, 7y, -3y
coefficients:  1, 7, -3
constant terms:  -9
SIMPLIFIED:  5y – 9

22.  2(x – 7) – 3x
   = 2x – 14 – 3x
   = -x – 14
23.  –4(n + 1) + 15n
  =  -4n – 4 + 15n
  =  11n – 4
24.  8p + 4 – (p + 4)
  =  8p + 4 – p – 4
  =  7p
25.  9t – 3(3t – 2)
   =  9t – 9t + 6
   =  6
26.  17 – x = 4;  12 is not a solution
27.  a/4 = 3;  12 is a solution
28.  Copy problem and show work!  x = -3
29.  Copy problem and show work!  h = 16
30.  Copy problem and show work!  r = -29
31.  Copy problem and show work!  s = 91
32.  30 ∙ x = 540
         30x = 540
          30       30
            x  = 18 ;  18 hrs
33.  Copy problem and show work!  –10.4
34.  Copy problem and show work!  -3.62
35.  Copy problem and show work!  5.58
36.  Copy problem and show work!  -5.5
37.  Copy problem and show work!  x = -11
38.  Copy problem and show work!  c = 4.07
39.  Copy problem and show work!  y = 3.8
40.  Copy problem and show work!  m = -28.22