462 algebra De mystif ieD

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

86. 
    

    (^312)
    x

    
    

    A. −x23/ B. x−32/ C. x−23/ D. −x32/

    
    


87. 
    

    A spirit club raises money by selling hamburgers at football games. They
    want to avoid handling change, so they want the hamburger to cost $5
    after adding 712 % sales tax. What should they charge for the hamburger?
    A. $4.65 B. $4.70 C. $4.75 D. $4.80

    
    


88. 
    

    45 xy−−^23 ()xy^43 +−xyxy 2123 − +=
    A. 20 xy−−^11 +− 48 xy−−^64 xx+ 4 23 y B. 20 xyxy+− 4842 yx+ 4 −y^3
    C. 20 xy−−^11 +− 48 xy^42 + 4 xy−^3 D. 20 xy^37 −+ 42 xy^54 xy^46 − 4 xy^23

    
    


89. 
    

    Fat free milk and whole milk (4%) will be mixed together to produce
    5 gallons of 1% milk. How much fat free milk will be used?
    A. 3 gallons B. 3.25 gallons C. 3.50 gallons D. 3.75 gallons

    
    


90. 
    

    7
    14

    
    

43

24

xy

xy

−

− =^

A. x

y

2

2 2 B.^

1

2

1

⋅xy 2 C.

1

2

xy^21 − D. 1

2

1

⋅xy 812

91. 2
    21

3

xx^22 ()++xx()xx^254

−

++

=

A. −−+

++

38

14

2

22

xx

xx()()x

B. −++

++

358

14

2

22

xx

xx()()x

C. −+

++

x

xx x

5

(^22) () 14 ()
D. −+
++
x
xx x
11
(^22) () 14 ()

92. The diameter of a rectangular room is 29 feet. The room is 1 foot longer
    than it is wide. How wide is the room?
    A. 20 feet B. 21 feet C. 22 feet D. 23 feet


93. If 56 xx^2 +−= 80 , then

A. x=−^25 4, B. x=− 52 4, C. x=−^45 2, D. x=−^45 2,