1.2: Practice Questions
Directions: For this section, solve each problem and decide which is the best of the choices given. You may use any available space for scratchwork.

(Numbers and Operations) — A racecar driver has completed
1212 laps of a50−lap race. What fractional part of the race remains?
1/4 
1/5 
3/4 
4/5 
75/2
ANSWER EXPLANATIONS — The driver has
50−1212 or3712 laps to go out of the50 laps . Therefore,371250 is the fractional part of the race remaining. This is equivalent to34 , which is answer C. This is the fraction of the race that the driver has completed.
 This comes from mistakenly dividing
1212 by6212 , the latter number coming from adding both lap amounts. The race is only50 laps .  Correct
 This comes from taking the fraction in response B and subtracting it from 1.
 This comes from
3712 , but that’s how many laps are left  the driver is only in one race, not50 !


(Numbers and Operations) — If
M is the set of positive multiples of2 less than150 andN is the set of positive multiples of9 less than150 , how many members are there inM \ n \ N ?
0 
8 
9 
18 
74
ANSWER EXPLANATIONS — The only elements in both sets are multiples of
2×9 or18 . The multiples of18 less than150 are18,36,54,72,90,108,126 and144 . These are the8 elements that are in the intersection of both sets. Thus, B is the correct response. There are elements that are in both sets.
 Correct
 There are
8 elements in both sets, not9 .  This is the number that the elements are multiples of.
 This is the number of multiples of
2 less than150  .


(Algebra and Functions) — If
x≠2y , thenx−2y2y−x+2y−xx−2y= 
2(x−2y) 
2y−x 
1 
0 
−2
ANSWER EXPLANATIONS — Both fractions each
r−1 , so adding−1 twice gives an answer of−2 . This is choice E. Both fractions are not equal to
(x−2y) , so we do not have2 like terms.  The other parts of the fractions are not eliminated, so this is not possible.
 Each fraction equals
−1 , so this result is not possible.  Each fraction equals
−1 , so adding−1 twice gives−2 .  Correct


(Algebra and Functions) — If
2x=10 , what is the value of625x ? ANSWER EXPLANATION Thex value is5 , so6255=125 . 
(Algebra and Functions) — If Dave drove onethird of the distance of his trip on the first day, and
60 miles on the second day, he figured out that he still had12 of the trip to drive. What was the total length, in miles, of his trip?
360 
180 
120 
60 
90
ANSWER EXPLANATIONS — We can model this situation by the equation
?x+60=12x . Solving forx , we getx=360 , which is answer A. Correct
 This is the number of miles he drove before he figured out how much of his trip was left.
 This amount is how much he drove the first day.
 This is how much he drove the second day.
 This amount is half of the distance he covered by the end of the second day.


(Geometry) — What is
f(2) for the graph off(x) below?
1 
12 
0 
2 
−1
ANSWER EXPLANATIONS — Asking for the value of
f(2) is just a way of saying “what doesy equal whenx=2 ?” So you look for whenx=2 . On the graph, we have the point(2,12) . Note that exact numbers are not provided in the graph, but standard practice indicates that each tick mark is one unit. So we moved2 tick marks to the right, and then the line crosses through a point on they axis between0 and1 . Therefore,f(2) is equal to12 . Choice B is the only possible choice. 

(Geometry) — Find the perimeter of lsosceles triangle
ABC ifmAD=3 andm<BAC=55∘ . Round to the nearest hundredth.
5.21 
10.42 
13.48 
16.46 
13.39
ANSWER EXPLANATIONS — Correct answer: D — The first step is to find one of the other sides of the triangle. The easiest is
AB . Since we have the side adjacent (next to) the angle we know, we can use cosine. Cosine of an angle= (adjacent)÷ (hypotenuse) The setup iscos55∘=3(AB) MultiplyingAB to the left gives(AB)cos55=3 Dividing bycos55 givesAB=3cos55∘ Using a calculator gives usAB=5.23 SinceAB = BC , we know thatAB + BC=10.46 . Also, sinceAD = DC , we know thatAD + DC=6 Therefore, the sum of all three sides is16.46 . 

(Geometry) — Which segment is congruent to
BE¯¯¯¯¯ ?
DE 
AC 
BD 
CE 
AE
ANSWER EXPLANATION Correct answer: D Congruent segments (or shapes of any kind) are exactly equal in length. The only segment in the diagram that we know is the same as BE is CE. Incorrect answers: A, E: Incorrectly assuming diagonals of a parallelogram are all equal B, C: Incorrectly assuming that the sides of the parallelogram are the same as BE just because they look like they are  never assume two segments are congruent just because they look like it. D: Correct answer


(Probability and Statistics) According to the graph, the greatest change in the profit of the Sports Shack occurred between which two consecutive months?
 January and February
 February and March
 March and April
 April and May
 May and June
ANSWER EXPLANATION — The profit in January was
$20,000 . The profit in February was−$20,000 . This represents a change in profit of−$40,000 , which is the greatest that the graph shows. 
(Probability and Statistics) — An automobile company made
36,000 automobiles in the proportions shown in the table below. How many of the automobiles produced were either SUVs or vans?
39 
9,000 
5,040 
14,040 
18,000
ANSWER EXPLANATION — SUVs and vans, together, made up
25%+14%=39% of the total production.39% of 36,000 autos is found by 0.39×36000=14040. 
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Feb 23, 2012Last Modified:
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