458 algebra De mystif ieD

DeMYSTiFieD / algebra DeMYSTiFieD / gibilisco / 000-0 / appendix

55. 48
    25

42

55

32

2

xyz^33

xyz

xyz

xyz

÷=

A.^88

35

xy^24 z

B. 88

35

x^2

yz

C. 88

35 2

y

xz

D. 88

35 2

yz

x

56. 6

(^49)

A.^293
4
B. 2 C. 234 D. 294

57. If −+ 32 =^3
    2

()x , then

A. x=−^16 B. x=−^13 C. x=^16 D. x=−^52

58. If () 32 xx+=^2 ()++ 53 ()x 2 , then

A. x=^32 only B. x=−^32 ,^23 C. x=− −^23 ,^52 D. x=− −^5 ,^23

59. Keisha has a 98 homework average in her math class. Her test grades are
    84, 85, and 88. If the homework average counts 10%, each tests counts
    20%, and the final exam counts 30%, what is the lowest grade she can get
    on the final to have at least a 90 course average?
    A. 92 B. 94 C. 96 D. 98


60. If 28 xx^2 ++= 30 , then

A. x=−±^410

2

B. x=−±^210

2

C. x=− ± 2210

D. x=− ± 8 10

2

61. 5 x=
    A. x^11 0/ B. x17/ C. x13/ D. x25/


62. 1
    x^2 + 9

=

A.^1

x+ 3

B. ()x^21 +^9 −/^2 C. x

x

2

2

9

9

−

+

D. −+()x^219 /^2