Math

Math 125
Exam 1B - Sections 1.2 - 1.8
Total Points: 100
NO track down SHOWN = 0 POINTS AWARDED! Each question is worth 4 points.
Solve the equation.
1) -49(x + 4) = -28(x + 7)= -49x-196=-28x-196
= +28 +28
=-21x-196=-196
= +196 +196
=-21x=0
=-21x/-21=0/-21
X=0


2) 7x + 1.3 = -17.6
-1.3 -1.3
=7x=-18.9
=7x/7=-18.9/7
X=-2.7

3) (x - 5) - (x + 9) = 6x= x-5-x+9=6x
=4-6x
=4/6=6x/6
2/3=x

4) 6x + 3 = 3x 21
-3 -3
=3x+3=-21
-3 -3
3x=-24
3x/3=-24/3
X=-8
quaternary CHOICE. Choose the one alternative that scoop completes the statement or answers the question.




5) x+66+x-23=56 6(x+66+x-23)=566

=(x+6)+2(x-2)=5
X+6+2x-4=5
3x+2=5
-2 -2
3x=3
3x/3=3/3
X=1 or B
A) 0 B) 1 C) 11
2
D) 15
Simplify the expression.
5) 3125-9-81-7
5(-9)-9(-7)
=-45-(-63)
=18 or D
A) -108 B) -18 C) 27 D) 18
7) |12(-3)| - |1 - 8|
=-36--7
= 36-(-7)
=36+7
=43 or A
A) 43 B) -43 C) 29 D) -29
SHOW ALL WORK! Simplify the expression.
8) 7[-4 + 3(-2 + 7)]
=7-4+3(5)
7-4+15
=7(11)
=77 or B
A) -13 B) 77 C) -39 D) -35
Simplify the expression.
9) 45x+12-16x-23

=2430x+1530-530x-2030

=1930x-530

=1930x-16
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
SHOW ALL WORK! Simplify the expression.
10) 7(12 - 21)2
7(-9)^2
=7(81)
=567orC
A) 81 B) -567 C) 567 D) -63
11) 75-(-5)-8

=75+5-8
=80-8
=-10 or B
A) 9 B) -10 C) -9 D) 10
Simplify the expression.
12) (9x - 12) - (5x + 1)
= 9x-12-5x+1
=4x-12+1
=4x-11
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