456 algebra De mystif ieD

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

40. 4 x−^2 =

A.^1

16 x^2

B. (^42)
x
C. 1
4 x^2
D. −^1
4 x^2
41.
1
83 ()x− 10

A.^1
8
1
310
⋅
x−
B. 1
8
() 31 x− 0 C. 8 1
31 x− 0




D. 83 ()x− 10
42. (^49) x=
A. 9 1
4
1
x




−
B. 9 4
1
x




−
C. 94 ()x−^1 D. 9
4
x^

43. A rectangular box is 8 inches tall. Its length is 1 inch longer than its
    width. The volume of the box is 240 in^3. How wide is the box?
    A. 5 inches B. 6 inches C. 8 inches D. 10 inches


44. Write

4

32 ()x− 1 as a product.

A.^4

3

() 21 x− B. (^4321) x^1 −




C. (^421) x^3 −




D. 4
32 ()x− 1
cannot be
written as a product.

45. If^32
    1

2

5

x

x

x

x

−

+

= − , then

A. x=^11 ± 32249 B. x=^11 ± 28233 C. x=^9 ± 32209 D. x=^13 ± 4

46. Simplify 610 −x.

A. 3 −^5 x B. 53 −^1 x C. 53 −^10 x D. (^610) −x cannot be simplified.

47. A nurse is ordered to administer 10 ml of a solution containing 18%
    concentrate of a drug. She has vials of 12% concentrate and 20% concen-
    trate. How much of each concentrate should she mix together to produce
    10 ml of a 12% concentrate?
    A. 2.5 ml of 12% and 7.5 ml of 20% B. 3 ml of 12% and 7 ml of 20%
    C. 3.5 ml of 12% and 6.5 ml of 20% D. 4 ml of 12% and 6 ml of 20%