Math WS #3 Part I – Set A Answers
Math WS #3 Part II – Set B Answers
Sets of Real Numbers
1) Z, Q, R
2) N, Z, Q, R
3) R (irrational)
4) Q, R
5) N, Z, Q, R
6) Z, Q, R
7) Z, Q, R
8) N, Z, Q, R
9) Q, R
10) N, Z, Q, R
11) Z, Q, R
12) R (irrational)
13) R (irrational)
14) R (irrational)
15) Q, R
16) N, Z, Q, R
17) Z, Q, R
18) Z, Q, R
19) N, Z, Q, R
20) Z, Q, R
The Real Numbers and
Absolute Value
1) -9
2) -3
3) -9
4) -3
5) 6
6) -2
7) -3
8) -2
9) -2
10) -2
11) 0
12) 18
13) 4
14) 5
15) 2
16) 18
17) true
18) true
19) false
20) true
21) false
22) -11/2; -8+5-5/2=-11/2
23) 3, -2, -7
Adding Real Numbers
1) 7
2) 3
3) -9
4) 6
5) -2
6) -7
7) 5
8) 7
9) 0
10) -17
11) 3.7
12) 7.5
13) 5.8
14) 2.4
15) 217/72
16) -33/5
17) 271/105
18) -1309/72
19) 5
20) 4
21) -1.25
22) 24
23) 5
24) 22.5
25) 1/4
26) 8/3
27) yes; $8
28) 11(F
Subtracting Real Numbers
1) -2
2) -3
3) -2
4) 2
5) 21
6) 540
7) 210
8) -10.76
9) 0.15
10) 319/30
11) -1129/105
12) 55/9
13) -307/14
14) -3/4
15) 4
16) 0
17) 3
18) 19/4
19) 31/4
20) -13/4
21) -28
22) 11.6
23) 5
24) 293/35
25) -13, -19, -24
26) -56/9 and -40/9
Multiplying and Dividing
Real Numbers
1) 1
2) 6
3) -23.1
4) -5/2
5) 9/2
6) 0
7) 229/14
8) 2.7632
9) 0.75
10) -0.75
11) -10
12) -3
13) -4.4375
14) -16.875
15) 37.125
16) -19.75
17) negative
18) positive
19) negative
20) zero
21) cannot be determined
22) positive
23) positive
24) undefined
25) positive
26) 3, -1, 1/3
27) $1973
Properties and Mental Computation
1) 6; 5; 0.9; 6; 5; 6; 0.9; 30; 5.4; 35.4
2) 7; 1/3; 9; 7; 9; 1/3; 63; 3; 66
3) Commutative Property of Multiplication
4) Distributive Property
5) Commutative Property of Addition
6) x=y (Given); xa=xa (Reflexive Property of Equality); xa=ya (Substitution Property of Equality)
7) m=n (Given); m+r=m+r (Reflexive Property of Equality); m+r=n+r (Substitution Property of Equality)
8) (x+y)+z=x+(y+z) (Associative Property of Addition); =(y+z)+x (Commutative Property of Addition); =(z+y)+x (Commutative Property of Addition)
9) 1/x(yx)=1/x(xy) (Commutative Property of Multiplication); =[(1/x)x]y (Associative Property of Multiplication); =1y (Multiplicative Inverse Property); =y (Multiplicative Identity Property)
Why Did the Cow Keep Jumping Over the Barrel?
She was practicing for a moon shot.
What Do You Call It When Police Interrogate a Cow’s Husband?
Questionable
Adding and Subtracting Expressions
1) 13x=(-14.1+27.1)x=014.1x+27.1x
2) -2.05z=(1-3.05)z=z-3.05z
3) (-9/8)a-(9/4)a=(-9/8-9/4)a= (-27/8)a
4) (-5/9)b+(7/3)b=(-5/9+7/3)b= (16/9)b
5) a+6b-5c
6) -10x+3y-2z
7) 2.8j-0.5k+0.1l
8) -0.2m+0.5n-0.6p
9) (10/3)r-2s+(39/4)t
10) (m/8)-2
11) 10q-4r+9
12) x+2y
13) 5a+10b-2
14) 3f+g+5h-1
15) 2a+3b
Multiplying and Dividing Expressions
1) 8a+5b2
2) -8m+0.5n
3) -2p2-p_3
4) 19r2-10r+4
5) 15a-9b+5c
6) -3x2+2x-10y+4
7) 120 cm3
8) 30 yd3
9) 2a2b
10) 3mnp
11) $64
12) $(40h+48)
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