1- Choice A is correct
The correct answer is − \ \frac{1}{8} The equation of a line in slope intercept form is: y=m \ x \ + \ b Solve for y. 8 \ x \ - \ y=2→ \ - \ y= \ - \ 8 \ x \ + \ 2 Divide both sides by (- \ 1). Then: - \ y= \ - \ 8 \ x \ + \ 2→y=8 \ x \ - \ 2 The slope of this line is 8. The product of the slopes of two perpendicular lines is - \ 1. Therefore, the slope of a line that is perpendicular to this line is: m_{1} \ × \ m_{2} = \ - \ 1 ⇒ 8 \ × \ m_{2} = \ - \ 1 ⇒ m_{2} = \frac{- \ 1}{8}= \ - \ \frac{1}{8}
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2- Choice B is correct
The correct answer is 104 Plug in the value of x and y. 4 \ (x \ - \ 5 \ y) \ + \ (6 \ - \ x)^2 when x=2 and y= - \ 4 x=2 and y= - \ 4 4 \ (x \ - \ 5 \ y) \ + \ (6 \ - \ x)^2=4 \ (2 \ - \ 5 \ (- \ 4)) \ + \ (6 \ - \ 2)^2=4 \ (2 \ + \ 20) \ + \ ( 4)^2 = 88\ + \ 16=104
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3- Choice C is correct
The correct answer is 67.5 Use PEMDAS (order of operation): \left[ 5 \ × \ (18) \ - \ 57 \ \right] \ – \ (– \ 12) \ + \ \left[ \ 5 \ × \ 9 \ \right] \ ÷ \ 2= \left[ 90 \ - \ 57 \ \right] \ + \ 12 \ + \ 45 \ ÷ \ 2= 33\ + \ 12 \ + \ 22.5 = \ 67.5
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4- Choice D is correct
The correct answer is − \ 153 To solve absolute values equations, write two equations. 2 \ x \ - \ 8 can equal positive 26, or negative 26. Therefore, 2 \ x \ - \ 8= 26 ⇒ 2 \ x=34⇒ x=17 2 \ x \ - \ 8= - \ 26 ⇒ 2 \ x= - \ 26 \ + \ 8= - \ 18⇒ x= - \ 9 Find the product of solutions: - \ 9 \ × \ 17= - \ 153
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5- Choice A is correct
The correct answer is 5.73 ft Write a proportion and solve for the missing number. \frac{46}{22} = \frac{12}{x}→ 46\ x=12\ × \ 22=264 46 \ x=264 →x=\frac{246}{46}=5.73
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5- Choice A is correct
The correct answer is 5.73 ft Write a proportion and solve for the missing number. \frac{46}{22} = \frac{12}{x}→ 46\ x=12\ × \ 22=264 46 \ x=264 →x=\frac{246}{46}=5.73
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6- Choice C is correct
Solve for x. - \ 2 \ ≤ \ 7 \ x \ - \ 2 \ < \ 12 ⇒ (add 4 all sides) - \ 2 \ + \ 2 \ ≤ \ 7 \ x \ - \ 2 \ + \ 2 \ < \ 12\ + \ 2 ⇒ 0 \ ≤ \ 7 \ x \ < \ 14 ⇒ (divide all sides by 7) 0 \ ≤ \ x \ < \ 2 x is between 0 and 2. Choice B represent this inequality.
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7- Choice A is correct
The correct answer is -\ 3 \ x^5 \ + \ 7 \ x^4 \ + \ 15 \ x^2\ + \ x^3 Simplify and combine like terms. (6 \ x^2 \ - \ 7 \ x^4 \ + \ 6 \ x^3 ) \ - \ (3 \ x^5 \ - \ 9 \ x^2 \ + \ 5 \ x^3 ) ⇒ (6 \ x^2 \ - \ 7 \ x^4 \ + \ 7 \ x^3 ) \ - \ 3 \ x^5 \ + \ 9 \ x^2 \ - \ 5 \ x^3⇒ -\ 3 \ x^5 \ + \ 7 \ x^4 \ + \ 15 \ x^2\ + \ x^3
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8- Choice C is correct
The correct answer is 343 7^3 = 7 \ × \ 7 \ × \ 7 = 343
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9- Choice D is correct
The correct answer is 96 cm^3 Volume of a box = length × width × height = 6 \ × \ 8 \ × \ 2 = 96
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10- Choice C is correct
The correct answer is 78.4 The area of the square is 387.3. Therefore, the side of the square is square root of the area. \sqrt{387.3}=19.6 Four times the side of the square is the perimeter: 4 \ × \ 19.6 = 78.4
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11- Choice A is correct
The correct answer is 68\% the population is increased by 25\% and 35\%. 15\% increase changes the population to 125\% of original population. For the second increase, multiply the result by 135\%. (1.25) \ × \ (1.35) =168\% 68 percent of the population is increased after two years.
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12- Choice B is correct
The correct answer is \frac{4}{3}, 55\%, 0.48, \frac{2}{5} Change the numbers to decimal and then compare. \frac{4}{3} = 1.333… 0.48 55\% = 0.55 \frac{2}{5} = 0.4 Therefore \frac{4}{3} \ < \ 55\% \ < \ 0.48 \ < \ \frac{ 2}{5}
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13- Choice C is correct
The correct answer is 144,000 Three times of 45,000 is 180,000. One sixth of them cancelled their tickets. One sixth of 180,000 equals 36,000\ (\frac{1}{5} \ × \ 180000 = 36000). 144,000 \ (180000 \ – \ 36000 = 144000) fans are attending this week
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14- Choice A is correct
The correct answer is \frac{1}{6} To get a sum of 5 for two dice, we can get 4 different options: (1, 4), (4, 1), (3, 2), (2, 3) To get a sum of 4 for two dice, we can get 2 different options: (2, 2), (1, 3) Therefore, there are 6 options to get the sum of 5 or 4. Since, we have 6 \ × \ 6 = 36 total options, the probability of getting a sum of 5 and 4 is 6 out of 36 or \frac{1}{6}.
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15- Choice D is correct
The correct answer is 180 cm^2 The perimeter of the trapezoid is 36 cm. Therefore, the missing side (height) is = 54 \ – \ 6 \ – \ 10 \ – \ 4 = 36 Area of a trapezoid: A = \frac{1}{2} \ h \ (b_1 \ + \ b_2) = \frac{1}{2} \ (36) \ (4 \ + \ 6) = 180
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16- Choice B is correct
The correct answer is 67.8 average (mean) = \frac{sum \ of \ terms}{number \ of \ terms} ⇒ 60= \frac{sum \ of \ terms}{68} ⇒ sum = 60\ × \ 68 = 4080 The difference of 32 and 23 is 10. Therefore, 10 should be subtracted from the sum. 4080 \ – \ 10 = 4070 mean = \frac{sum \ of \ terms}{number \ of \ terms} ⇒ mean = \frac{4070}{60} = 67.8
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17- Choice D is correct
The correct answer is 33,000 and 78,120 (If you selected 3 choices and 2 of them are correct, then you get one point. If you answered 2 or 3 choices and one of them is correct, you receive one point. If you selected more than 3 choices, you won’t get any point for this question.) In the stadium the ratio of home fans to visiting fans in a crowd is 9:6. Therefore, total number of fans must be divisible by 15: \ 9 \ + \ 6 = 15. Let’s review the choices: ☐A. 12,324: 12,324 \ ÷ \ 15 = 821.6 ☐B. 78,120: 16,788 \ ÷ \ 15 = 5,208 ☐C. 42,326: 42,326 \ ÷ \ 15 =2,821.7 ☐D. 33,000: 33,000 \ ÷ \ 15 = 22,000 ☐E. 66,812: 66,812 \ ÷ \ 15 =4,454.1333 Only choices D and B when divided by 15 result a whole number.
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18- Choice C is correct
The correct answer is 6 Use formula of rectangle prism volume. V = (length) (width) (height) ⇒ 4000 = (20) \ (25) (height) ⇒ height = 3000 \ ÷ \ 500 = 6
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19- Choice D is correct
The correct answer is 18 The diagonal of the square is 6. Let x be the side. Use Pythagorean Theorem: a^2 \ + \ b^2 = c^2 x^2 \ + \ x^2 = 6^2 ⇒ 2 \ x^2 = 6^2 ⇒ 2 \ x^2 = 36 ⇒ x^2 = 18 ⇒ x= \sqrt{18} The area of the square is: \sqrt{18} \ × \ \sqrt{18} =18
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20- Choice B is correct
The correct answer is \frac{1}{6} Probability = \frac{number \ of \ desired \ outcomes}{number \ \ of \ total \ outcomes} = \frac{8}{11 \ + \ 8 \ + \ 16 \ + \ 13} = \frac{8}{48} = \frac{1}{6}
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21- Choice A is correct
The correct answer is 42 To find the number of possible outfit combinations, multiply number of options for each factor: 7 \ × \ 3 \ × \ 2= 42
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22- Choice D is correct
The correct answer is \frac{3}{4} The probability of choosing a Hearts is \frac{14}{64}=\frac{3}{4}
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23- Choice B is correct
The correct answer is 17 average = \frac{sum \ of \ terms}{number \ of \ terms} ⇒ (average of 4 numbers) 31 = \frac{sum \ of \ numbers}{4} ⇒ sum of 4 numbers is 31 \ × \ 4 = 124 (average of 3 numbers) 23 = \frac{sum \ of \ numbers}{3} ⇒ sum of 3 numbers is 23 \ × \ 3 = 56 sum of 4 numbers – sum of 3 numbers = sum of 4 numbers 124 \ – \ 56 = 68, average of 4 numbers = \frac{68}{4 }= 17
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24- Choice E is correct
The correct answer is (− \ 2,3) and (0, 2) (If you selected 3 choices and 2 of them are correct, then you get one point. If you answered 2 or 3 choices and one of them is correct, you receive one point. If you selected more than 3 choices, you won’t get any point for this question.) 4\ x \ - \ y=8. Plug in the values of x and y from choices provided. Then: ☐A. (- \ 2,3): 4 \ x \ - \ y=8→ \ - \ 4 \ (2)\ - \ 3 =8→ \ - \ 8 \ - \ 3=11 This is NOT true! ☐B. (1,2): 4 \ x \ -\ y=8→4\ (1) \ - \ 2 =8→4 \ - \ 2=2 This is NOT true! ☐C. (- \ 1,3): 4 \ x \ - \ y=8→ \ 4\ (- \ 1) \ - \ 3=4→ \ - \ 4 \ - \ 3=- \ 7 This is NOT true! ☐D. (- \ 3,4): 4 \ x \ - \ y=8→ \ 4\ (- \ 3) \ - \ 4=8→ \ - \ 12 \ - \ 4=8 This is true! ☐E. (4,8): 4 \ x \ - \ y=8→4 \ (4) \ - \ 8 =8→16 \ - \ 8=8 This is true!
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25- Choice A is correct
The correct answer is 8 meters The width of the rectangle is twice its length. Let x be the length. Then, width =3 \ x Perimeter of the rectangle is 2 (width + length) = 2 \ (3 \ x \ + \ x)=56 ⇒ 7\ x=56 ⇒ x=8 Length of the rectangle is 8 meters.
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26- Choice E is correct
The correct answer is 30 and 25 (If you selected 3 choices and 2 of them are correct, then you get one point. If you answered 2 or 3 choices and one of them is correct, you receive one point. If you selected more than 3 choices, you won’t get any point for this question.) First, find the sum of five numbers. average = \frac{sum \ of \ terms}{number \ of \ terms} ⇒ 12 = \frac{sum \ of \ 3\ numbers}{3 }⇒ sum of 3 numbers = 12 \ × \ 3 = 36 The sum of 3 numbers is 36. If a fouth number that is greater than 52 is added to these numbers, then the sum of 4 numbers must be greater than 88. 36 \ + \ 52 = 88 If the number was 52 , then the average of the numbers is: average = \frac{sum \ of \ terms}{number \ of \ terms} = \frac{88}{4} = 22 Since the number is bigger than 52. Then, the average of six numbers must be greater than 22. Choices B and E are greater than 22.
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27- Choice A is correct
The correct answer is 2 Solving Systems of Equations by Elimination Multiply the first equation by (– \ 3), then add it to the second equation. \cfrac{\begin{align} \ 3 \ x \ + \ 6 \ y \ = \ 18 \\- \ 3 \ ( x \ - \ 4 \ y \ = \ - \ 6 )\end{align}}{\cfrac{\begin{align} 3 \ x \ + \ 6\ y \ = 18 \\ -\ 3 \ x \ + \ 12 \ y \ = 18 \end{align}}{{\begin{align} 18\ y \ = 36 \\ ⇒ y \ = \ 2 \end{align}} } } ⇒ Plug in the value of y into one of the equations and solve for x. 3 \ x \ + \ 6 \ (2)= 18 ⇒ 3 \ x \ + \ 12= 18 ⇒ 3 \ x= 6 ⇒ x= 2
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28- Choice C is correct
The correct answer is \frac{1}{10} 3,000 out of 45,000 equals to \frac{3000}{45000 }= \frac{1500}{15000} =\frac{1}{10}
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29- Choice C is correct
The correct answer is 14 Let x be the width of the rectangle. Use Pythagorean Theorem: a^2 \ + \ b^2 = c^2 x^2 \ + \ 3^2 = 5^2 ⇒ x^2 \ + \ 9 = 25 ⇒ x^2 = 25 \ – \ 9 = 16 ⇒ x = 4 Perimeter of the rectangle = 2 (length + width) = 2 \ (3 \ + \ 4) = 2 \ (7) = 14
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30- Choice C is correct
The correct answer is 720 \ π in^2 Surface Area of a cylinder = 2 \ π \ r \ (r \ + \ h), The radius of the cylinder is 6 \ (12 \ ÷ \ 2) inches and its height is 10 inches. Therefore, Surface Area of a cylinder = 2 \ π \ (6) \ (6 \ + \ 10) = 720 \ π in^2
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31- Choice B is correct
The correct answer is 8 The ratio of boy to girls is 6:8. Therefore, there are 6 boys out of 14 students. To find the answer, first divide the total number of students by 14, then multiply the result by 4. 56 \ ÷ \ 14 = 4 ⇒ 4 \ × \ 6 = 24 There are 24 boys and 32 \ (56 \ – \ 24) girls. So, 8 more boys should be enrolled to make the ratio 1:1
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32- Choice C is correct
The correct answer is 85 Jason needs an 82\% average to pass for five exams. Therefore, the sum of 5 exams must be at least 5 \ × \ 82 =410 The sum of 4 exams is: 62\ + \ 95 \ + \ 78 \ + \ 90 = 325. The minimum score Jason can earn on his fifth and final test to pass is: 410\ – \ 325 = 85
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33- Choice C is correct
The correct answer is 80 \ x^{10} \ y^8 Simplify: 5 \ x^4 \ y^6 \ (4 \ x^3 \ y)^2= 5 \ x^4 \ y^6 \ (16 \ x^6 \ y^2 ) = 80 \ x^{10} \ y^8
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34- Choice A is correct
The correct answer is \frac{64}{343} The square of a number is \frac{16}{49}, then the number is the square root of \frac{16}{49} \sqrt{\frac{16}{49}}= \frac{4}{7} The cube of the number is: (\frac{4}{7})^3 = \frac{64}{343}
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35- Choice B is correct
The correct answer is \frac{2}{3} Isolate and solve for x. \frac{4}{5} \ x \ + \ \frac{1}{3}= \frac{1}{5} ⇒ \frac{4}{5} \ x= \frac{1}{5} \ - \ \frac{1}{3} = \frac{8}{15} ⇒ \frac{4}{5} \ x= \frac{8}{15} Multiply both sides by the reciprocal of the coefficient of x. (\frac{5}{4}) \ \frac{4}{5} \ x= \frac{8}{15} \ (\frac{5}{4}) ⇒ x= \frac{8}{12}=\frac{2}{3}
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36- Choice D is correct
The correct answer is 30 Write the numbers in order: 3, 14, 27, 30, 46, 52, 85 Median is the number in the middle. So, the median is 30.
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37- Choice C is correct
The correct answer is $625 Use simple interest formula: I=prt (I = interest, p = principal, r = rate, t = time) I=(25000) \ (0.005) \ (5)=625
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38- Choice C is correct
The correct answer is 50 Use the information provided in the question to draw the shape. Use Pythagorean Theorem: a^2 \ + \ b^2 = c^2 40^2 \ + \ 30^2 = c^2 ⇒ 1600\ + \ 900 = c^2 ⇒ 2500= c^2 ⇒ c = 50
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39- Choice A is correct
The correct answer is $336 Let x be all expenses, then: \frac{22}{100} \ x=$264 →x=\frac{100 \ × \ $264}{22}=$1,200 He spent for his rent: \frac{28}{100} \ × \ $1,200=$336
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40- Choice D is correct
The correct answer is 16 First, find the number. Let x be the number. Write the equation and solve for x. 75\% of a number is 48, then: 0.75\ × \ x=48 ⇒ x=48 \ ÷ \ 0.75=64 25\% of 64 is: 0.25\ × \ 64 = 16
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41- Choice C is correct
The correct answer is 7 hours The distance between Jason and Joe is 14 miles. Jason running at 6 miles per hour and Joe is running at the speed of 8 miles per hour. Therefore, every hour the distance is 2 miles less. 14 \ ÷ \ 2 = 7
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42- Choice A is correct
The correct answer is 56 Plug in 100 for F and then solve for C. C = \frac{7}{8} (F – \ 36) ⇒ C = \frac{7}{8} (100 \ – \ 36) ⇒ C = \frac{7}{8} \ (64) = 56
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43- Choice B is correct
The correct answer is 85\% The failing rate is 12 out of 80 = \frac{12}{80} Change the fraction to percent: \frac{12}{80} \ × \ 100\%=15% 15 percent of students failed. Therefore, 85 percent of students passed the exam.
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44- Choice B is correct
The correct answer is 56 Let x be the number. Write the equation and solve for x. 25\% of x=14⇒ 0.25 \ x=14 ⇒ x=14 \ ÷ \ 0.25=56
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45- Choice C is correct
The correct answer is 100 \ x \ + \ 11,000 \ ≤ \ 18,000 Let x be the number of new shoes the team can purchase. Therefore, the team can purchase 100 \ x. The team had $18,000 and spent $11,000. Now the team can spend on new shoes $7,000 at most. Now, write the inequality: 100 \ x \ + \ 11,000 \ ≤ \ 18,000
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46- Choice C is correct
The correct answer is 3 Solve for y. 3 \ x \ - \ y=9 ⇒ -\ y=9 \ - \ 3 \ x ⇒ y=3 \ x \ - \ 9 The slope of the line is 3.
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