# Algebra 1 Semester Exam

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Use this test for extra credit and to prepare for the upcoming semester exam.
Note: ^ indicates an exponet. For example x^2 reads x to the second power.

• 1.

### The tThe table below shows a set of values for x and y.  Which equation best represents this set of data? x -2 -1 1 3 4 y 8 5 -1 -7 -10

• A.

Y = 2x – 5

• B.

Y = 2x – 3

• C.

Y = -3x+2

• D.

Y = -2x + 3

C. Y = -3x+2
Explanation
The equation y = -3x+2 best represents the set of data because it is the only equation that produces the correct values of y for each given value of x. When x is -2, y is 8. When x is -1, y is 5. When x is 1, y is -1. When x is 3, y is -7. When x is 4, y is -10. Therefore, y = -3x+2 is the correct equation for this set of data.

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• 2.

### WhicWhich equation describes the data in the table?   xy -3 3 0 1 3 -1 6 -3

• A.

Y = 3/2x +1

• B.

Y = 3/2x – 1

• C.

Y = 2/3x + 3

• D.

Y = -2/3x + 1

D. Y = -2/3x + 1
Explanation
The equation y = -2/3x + 1 describes the data in the table. This can be determined by observing the pattern in the values of x and y. As x increases by 3, y decreases by 2. This relationship is consistent throughout the table, indicating a linear relationship between x and y. The equation y = -2/3x + 1 represents a line with a slope of -2/3 and a y-intercept of 1, which aligns with the data in the table.

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• 3.

### WWWhat  is the slope-intercept form of a line whose slope is -2 and has a y-intercept of 3?

• A.

Y = 5x – 2

• B.

Y = 2 – 5x

• C.

Y = -2x + 3

• D.

Y = -2/5x

C. Y = -2x + 3
Explanation
The slope-intercept form of a line is given by y = mx + b, where m is the slope and b is the y-intercept. In this case, the slope is -2 and the y-intercept is 3. Therefore, the equation of the line in slope-intercept form is y = -2x + 3.

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• 4.

### In           In the  In the equation 2x + 3y = 6, what is the slope and y-intercept?

• A.

M = -2/3 ; b = 2

• B.

M = -3/2 ; b = 2

• C.

M = 2/3 ; b = 2

• D.

M = 2/3 ; b = 3

A. M = -2/3 ; b = 2
Explanation
The given equation is in the form of y = mx + b, where m is the slope and b is the y-intercept. By rearranging the equation, we can see that the coefficient of x is the slope and the constant term is the y-intercept. In this case, the coefficient of x is -2/3, so the slope is -2/3. The constant term is 2, so the y-intercept is 2. Therefore, the correct answer is m = -2/3 ; b = 2.

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• 5.

### W        W hat is the slope-intercept form of a line containing the points (4,4) and (2,-1)?

• A.

Y = 5/2x + 6

• B.

Y = 5/2x - 6

• C.

Y = -2x + 6

• D.

Y = 2x – 6

B. Y = 5/2x - 6
Explanation
The slope-intercept form of a line is y = mx + b, where m is the slope and b is the y-intercept. To find the slope, we use the formula (y2 - y1) / (x2 - x1) with the given points (4,4) and (2,-1). The slope is (4 - (-1)) / (4 - 2) = 5/2. The y-intercept can be found by substituting one of the points into the equation and solving for b. Using the point (4,4), we have 4 = (5/2)(4) + b, which simplifies to b = -6. Therefore, the equation of the line is y = 5/2x - 6.

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• 6.

### Kevin has 250 marbles, some red and the rest blue.  He has 24 more blue marbles than red marbles.  How many blue marbles does he have?

• A.

113

• B.

157

• C.

137

• D.

123

C. 137
Explanation
Kevin has a total of 250 marbles, some of which are red and the rest are blue. The question states that he has 24 more blue marbles than red marbles. To find the number of blue marbles, we can set up an equation. Let's assume the number of red marbles is "x". Since Kevin has 24 more blue marbles than red marbles, the number of blue marbles would be "x + 24". The total number of marbles is given as 250, so we can write the equation as "x + (x + 24) = 250". By solving this equation, we find that x = 113, which means Kevin has 113 red marbles. Therefore, the number of blue marbles would be 113 + 24 = 137.

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• 7.

### What is the slope of the line containing the points (2,5) and (-4, -3)?

• A.

4/3

• B.

3/4

• C.

-4/3

• D.

-3/4

A. 4/3
Explanation
The slope of a line can be found using the formula (y2 - y1) / (x2 - x1), where (x1, y1) and (x2, y2) are the coordinates of two points on the line. In this case, the coordinates are (2,5) and (-4,-3). Plugging these values into the formula gives (5 - (-3)) / (2 - (-4)), which simplifies to 8 / 6, or 4 / 3. Therefore, the slope of the line is 4/3.

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• 8.

### Write the equation 4x + 3y = 12 in slope-intercept form.

• A.

Y = 3/4x + 4

• B.

Y = 4/3x - 4

• C.

Y = 4/3x + 4

• D.

Y = -4/3x + 4

D. Y = -4/3x + 4
Explanation
The given equation 4x + 3y = 12 can be rearranged to solve for y in terms of x, which is the slope-intercept form. By isolating the term with y, we get 3y = -4x + 12. Dividing both sides by 3, we have y = -4/3x + 4. Therefore, the correct answer is y = -4/3x + 4.

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• 9.

### What is the solution of 6x + 2 = 2(2x + 2)?

• A.

X = -1

• B.

X = 2

• C.

X = -2

• D.

X = 1

D. X = 1
Explanation
To find the solution to the equation 6x + 2 = 2(2x + 2), we can start by simplifying the equation. Distributing 2 to 2x + 2 gives us 6x + 2 = 4x + 4. Next, we can subtract 4x from both sides to isolate the x term, resulting in 2x + 2 = 4. Subtracting 2 from both sides gives us 2x = 2. Finally, dividing both sides by 2 gives us x = 1. Therefore, the correct answer is x = 1.

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• 10.

### What is the solution of 2(5x) = 2x + 3x + 40?

• A.

X = 20

• B.

X = 4

• C.

X = 8

• D.

X = 16.6

C. X = 8
Explanation
To solve the equation 2(5x) = 2x + 3x + 40, we can simplify the left side by distributing the 2 to the terms inside the parentheses. This gives us 10x = 2x + 3x + 40. Combining like terms on the right side, we get 10x = 5x + 40. Next, we can subtract 5x from both sides to isolate the x term. This gives us 5x = 40. Finally, dividing both sides by 5, we find that x = 8, which is the solution to the equation.

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• 11.

### What is the equation of a line with the point (3, 0) and goes through the y axis at (0, -2)?

• A.

Y = 3/2x + 2

• B.

Y = 2/3x - 2

• C.

Y = -2/3x -2

• D.

Y = -2/3x + 2

B. Y = 2/3x - 2
Explanation
The equation of a line can be determined using the slope-intercept form, which is y = mx + b, where m is the slope and b is the y-intercept. In this case, the line passes through the point (3, 0) and the y-axis at (0, -2). To find the slope, we can use the formula (y2 - y1) / (x2 - x1), which gives us (0 - (-2)) / (3 - 0) = 2/3. Therefore, the slope of the line is 2/3. The y-intercept is given as -2. Plugging these values into the slope-intercept form, we get y = 2/3x - 2.

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• 12.

### Henry was biking and saw a sign that said “240 miles to Gainesville”.  On his map, ½ of an inch equals 20 miles.  How long in inches is the distance from where Henry is to Gainesville?

• A.

12

• B.

120

• C.

6

• D.

60

C. 6
Explanation
The distance from where Henry is to Gainesville is 240 miles. On his map, ½ of an inch equals 20 miles. Therefore, we can set up a proportion to find the length in inches. If 20 miles is equal to ½ inch, then 240 miles is equal to x inches. Cross-multiplying, we get 20 * x = 240 * ½. Simplifying, we get 20x = 120. Dividing both sides by 20, we find that x = 6. Therefore, the distance from where Henry is to Gainesville is 6 inches on the map.

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• 13.

• A.

18

• B.

16

• C.

32

• D.

20

B. 16
• 14.

### Tom can create 9 rolls of sushi every 40 minutes.  How many rolls can he make in six hours?

• A.

81

• B.

86

• C.

44

• D.

36

A. 81
Explanation
Tom can create 9 rolls of sushi every 40 minutes. To find out how many rolls he can make in six hours, we need to convert six hours into minutes. There are 60 minutes in an hour, so six hours is equal to 6 x 60 = 360 minutes. Now we can calculate the number of rolls by dividing the total minutes (360) by the time taken to make each roll (40). 360 divided by 40 equals 9. Therefore, Tom can make 9 rolls every 40 minutes, and in six hours, he can make 9 x 9 = 81 rolls.

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• 15.

### Two rectangles are similar.  Rectangle “A” has a width of 12 feet and a length of 15 feet.  If triangle “B” has a length of 60 feet, what is its width?

• A.

57

• B.

63

• C.

84

• D.

48

D. 48
Explanation
Since the two rectangles are similar, their corresponding sides are proportional. The ratio of the length of rectangle A to the length of rectangle B is 15:60, which simplifies to 1:4. Therefore, the width of rectangle B can be found by multiplying the width of rectangle A (12 feet) by the same ratio. 12 feet multiplied by 1 is 12 feet, and 12 feet multiplied by 4 is 48 feet. Hence, the width of rectangle B is 48 feet.

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• 16.

### While hiking on a trail, George measured his shadow at 12 feet long; George is 5 feet tall.  At the same time, George measured a tree’s shadow to be 60 feet long.  How tall is the tree?

• A.

45

• B.

54

• C.

25

• D.

30

C. 25
Explanation
George's shadow is 12 feet long and he is 5 feet tall. If we set up a proportion using the lengths of the shadows, we can find the height of the tree. The proportion would be: George's height / George's shadow length = Tree's height / Tree's shadow length. Plugging in the values, we get: 5 / 12 = Tree's height / 60. Solving for the tree's height, we find that it is 25 feet tall.

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• 17.

### Lt. Dahlia Johnson is a jet pilot in the United States Navy. After her jet is launched from the flight deck of an aircraft carrier, the jet’s altitude above sea level increases at a constant rate of 65 feet per second.  If the flight deck of the carrier is 90 feet above sea level, which equation could be used to find t, the number of seconds it will take Lt. Johnson to reach her cruising altitude of 20,000 feet above sea level?

• A.

A

• B.

B

• C.

C

• D.

D

A. A
Explanation
The equation that could be used to find the number of seconds it will take Lt. Johnson to reach her cruising altitude of 20,000 feet above sea level is t = (20000 - 90) / 65. This equation subtracts the initial altitude of 90 feet from the target altitude of 20,000 feet and then divides it by the rate of increase in altitude, which is 65 feet per second. This will give the time, in seconds, it will take for Lt. Johnson to reach her cruising altitude.

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• 18.

### The population of a town is 13,000 and is increasing by about 250 people per year. This information can be represented by the following equation, where y represents the number of years and p represents the population.   p =13,000 + 250y  According to the equation above, in how many years will the population of the town be 15,500?

• A.

6

• B.

10

• C.

1250

• D.

20

B. 10
Explanation
The equation given represents the population of the town as a function of the number of years. To find the number of years it will take for the population to reach 15,500, we can set the equation equal to 15,500 and solve for y. By substituting 15,500 for p in the equation, we get 15,500 = 13,000 + 250y. Solving this equation for y, we find that y = 10. Therefore, it will take 10 years for the population of the town to reach 15,500.

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• 19.

### On a coordinate grid, the location of a lighthouse is at (8, 7) and the location of a buoy is at (-6, -3). At noon, a ship was at the middle of the segment connecting the lighthouse and the buoy. Which of the choices below best describes the ship location at noon?

• A.

Y-axis

• B.

• C.

• D.

Explanation
The ship location at noon would be in Quadrant 1 because the ship is at the middle of the segment connecting the lighthouse (located in Quadrant 1) and the buoy (located in Quadrant 3). Since the ship is closer to the lighthouse, it would be in the same quadrant as the lighthouse, which is Quadrant 1.

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• 20.

### David and Terri drove a small motorboat down a river with the current. The rate the boat traveled in still water was r miles per hour and the current’s average speed was c miles per hour. It took them 4.5 hours to travel 12 miles downstream. Which of the following equations can be used to represent this information?

• A.

4.5 = (r + c)12

• B.

4.5 = (r - c)12

• C.

12 = (r + c)4.5

• D.

12 = (r - c)4.5

C. 12 = (r + c)4.5
Explanation
The equation 12 = (r + c)4.5 can be used to represent the information because it states that the distance traveled, which is 12 miles, is equal to the rate of the boat in still water plus the current's average speed, multiplied by the time it took to travel, which is 4.5 hours.

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• 21.

• A.

2 km/h

• B.

4 km/h

• C.

6 km/h

• D.

8 km/h

B. 4 km/h
• 22.

### If f(x) = x2 + 4x + 12 , then what is f(4) – f(2)?

• A.

20

• B.

2

• C.

28

• D.

-28

A. 20
Explanation
To find f(4) - f(2), we substitute the values of x into the given function.
f(4) = (4^2) + 4(4) + 12 = 16 + 16 + 12 = 44
f(2) = (2^2) + 4(2) + 12 = 4 + 8 + 12 = 24
Therefore, f(4) - f(2) = 44 - 24 = 20.

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• 23.

### An artist sells earrings from a booth at a fair. Rent for the booth is \$140. The artist makes \$8 from each pair of earrings sold. The profit in dollars, P, can be found using the following equation, where n is the number of pairs of earrings sold. P = 8n - 140 How many pairs of earrings must the artist sell to earn a profit of \$580?

• A.

55

• B.

90

• C.

60

• D.

70

B. 90
Explanation
To find the number of pairs of earrings the artist must sell to earn a profit of \$580, we can set up the equation P = 8n - 140, where P is the profit and n is the number of pairs of earrings sold. We want to find the value of n when P = 580.
So, we can substitute P = 580 into the equation and solve for n:
580 = 8n - 140
720 = 8n
Divide both sides by 8:
90 = n
Therefore, the artist must sell 90 pairs of earrings to earn a profit of \$580.

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• 24.

### Each ship that passes through the Panama Canal requires about 52 million gallons of water to move the ship through the canal from the Atlantic Ocean to the Pacific Ocean. If 24 ships passed through the canal, moving from the Atlantic Ocean to the Pacific Ocean, which is closest to the number of gallons of water that was required?

• A.

1.2 x 10^8 gallons

• B.

1.2 x 10^9 gallons

• C.

8.8 x 10^8 gallons

• D.

8.8 x 10^9 gallons

B. 1.2 x 10^9 gallons
Explanation
^ indicates an exponent ie. 3^2 is three squared or three to the second power.

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• 25.

### If f(x) = x2 - 2x + 2, then what is f(4) – f(2)?

• A.

0

• B.

12

• C.

8

• D.

4

C. 8
Explanation
To find f(4) - f(2), we first need to find the values of f(4) and f(2).
Substituting x = 4 into the equation f(x) = x^2 - 2x + 2, we get f(4) = 4^2 - 2(4) + 2 = 16 - 8 + 2 = 10.
Substituting x = 2 into the equation, we get f(2) = 2^2 - 2(2) + 2 = 4 - 4 + 2 = 2.
Therefore, f(4) - f(2) = 10 - 2 = 8.

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• 26.

### Which is the correct way to express the atomic weight of an atom equaling .00000362 in scientific notation?

• A.

3.62 x 10^4

• B.

3.62 x 10^6

• C.

3.62 x 10^-4

• D.

3.62 x 10^-6

D. 3.62 x 10^-6
Explanation
The correct way to express the atomic weight of an atom equaling .00000362 in scientific notation is 3.62 x 10^-6. In scientific notation, the number is written in the form of a decimal number between 1 and 10 multiplied by a power of 10. In this case, the decimal number is 3.62 and it is multiplied by 10 raised to the power of -6, which indicates that the decimal point is moved 6 places to the left.

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• 27.

### Evaluate 31,000,000. Which shows the answer in scientific notation?

• A.

3.1 x 10^6

• B.

3.1 x 1^-6

• C.

3.1 x 10^7

• D.

3.1 x 10^-7

C. 3.1 x 10^7
Explanation
The correct answer is 3.1 x 10^7. This is the answer in scientific notation because it represents the number 31,000,000 as a coefficient (3.1) multiplied by 10 raised to the power of 7. Scientific notation is commonly used to express very large or very small numbers in a more compact and convenient form.

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• 28.
• A.

A

• B.

B

• C.

C

• D.

D

B. B
• 29.
• A.

A

• B.

B

• C.

C

• D.

D

D. D
• 30.
• A.

-64

• B.

-2

• C.

2

• D.

64

A. -64
• 31.

### Sinbad is working in the lab, using a formula for chemical reactions. The number of seconds to complete a reaction is given by the equation below, where t is the number of seconds and C is the temperature in degrees Celsius when the reaction occurred. t = 575 – 10C – C2 If his reaction was completed in 375 seconds, which of the following is one of the temperatures in degrees Celsius at the start of the chemical reaction?

• A.

10

• B.

8

• C.

12

• D.

9

A. 10
Explanation
The given equation is used to calculate the number of seconds it takes for a chemical reaction to complete based on the temperature in degrees Celsius. Sinbad's reaction took 375 seconds, so we need to find a temperature that satisfies the equation t = 575 - 10C - C^2. By substituting t = 375 into the equation, we can solve for C. The only temperature that satisfies the equation is C = 10. Therefore, 10 is one of the possible temperatures in degrees Celsius at the start of the chemical reaction.

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• 32.

### Which of the following expressions is equivalent to 3x + 6(2 + x)?

• A.

4x + 8

• B.

9x + 12

• C.

4x + 12

• D.

9x + 6

B. 9x + 12
Explanation
The given expression is 3x + 6(2 + x). Distributing the 6 into the parentheses, we get 3x + 12 + 6x. Combining like terms, we have 9x + 12. Therefore, the expression that is equivalent to 3x + 6(2 + x) is 9x + 12.

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• 33.

### Which of the following expressions is equivalent to 2x + 3c + 2(3c + 3x)?

• A.

8x + 9c

• B.

8x + 10c

• C.

7x + 8c

• D.

7x + 7c + 2

A. 8x + 9c
Explanation
The given expression is equivalent to 2x + 3c + 2(3c + 3x) = 2x + 3c + 6c + 6x = 8x + 9c.

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• 34.

### What is the value of x if y = 2 in the following expression, x = y (y3)?

• A.

12

• B.

9

• C.

8

• D.

16

D. 16
Explanation
In the given expression, x = y (y3), the value of y is given as 2. Therefore, substituting y = 2 into the expression, we get x = 2(23) = 2(8) = 16. Hence, the value of x is 16.

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• 35.

### Let 3n represent the lesser of three consecutive odd integers. Which equation would you use to find the three integers if their sum is 33?

• A.

3n + 3n + 3n = 33

• B.

(n + 2) + (n + 4) = 33

• C.

3n + (3n +2) + (3n + 4) = 33

• D.

3n + (n +2) + (n + 4) = 33

C. 3n + (3n +2) + (3n + 4) = 33
Explanation
The equation 3n + (3n +2) + (3n + 4) = 33 would be used to find the three integers if their sum is 33. In this equation, 3n represents the lesser of the three consecutive odd integers. By adding the next two odd integers (3n + 2) and (3n + 4) to the initial integer, we can find the sum of the three integers, which should be equal to 33.

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• 36.

### Kat knows the area of the rectangular family room floor in her house measures 362 square meters. The length of the floor is 6 meters longer than the width. Use w for the width of the floor. Which equation would calculate the length and width of Kat’s floor in her family room?

• A.

2w + 2(w + 6) = 362

• B.

W(w – 6) = 362

• C.

W(w + 6) = 362

• D.

6w – 6 = 362

C. W(w + 6) = 362
Explanation
The correct equation to calculate the length and width of Kat's floor is w(w + 6) = 362. This equation represents the area of the rectangular floor, where w represents the width and (w + 6) represents the length. By multiplying the width and the length, we get the area of the floor, which is equal to 362 square meters.

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• 37.

### The owner of a convenience store recorded the number customers in the store from 1:00 PM to 5:00 pm who were served Slurpees and the number of pints of Slurpee syrup that were used. Number of Boxes of Syrup, p Number of Customers, c 3 18 4 24 5 30 6 36 7 42Which equation best describes the relationship between the number of customers who bought Slurpees and the number of boxes of syrup for those Slurpees?

• A.

C = p + 6

• B.

C = p

• C.

C = 6p + 6

• D.

C = 6p

D. C = 6p
Explanation
The equation c = 6p best describes the relationship between the number of customers who bought Slurpees and the number of boxes of syrup for those Slurpees. This is because for every box of syrup used, there are 6 customers who bought Slurpees. Therefore, the number of customers, c, is equal to 6 times the number of boxes of syrup, p.

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• 38.

### If Brian makes \$y per day and spends \$x per day, how many dollars will he save in 10 days?

• A.

10(y - x)

• B.

10y - x

• C.

10(x - y)

• D.

10x - 10y

A. 10(y - x)
Explanation
Brian saves money by subtracting his daily expenses (x) from his daily earnings (y). To find out how much he will save in 10 days, we multiply the difference between his earnings and expenses (y - x) by the number of days (10). Therefore, the correct answer is 10(y - x).

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• 39.

### The tax on the price of an iPhone is \$22.00. If the retail price is \$221.00, which equation could you use to find the total price of the iPhone?

• A.

22 = x + 221

• B.

22 = x - 221

• C.

221 = x + 22

• D.

221 = 22x

B. 22 = x - 221
Explanation
The equation 22 = x - 221 could be used to find the total price of the iPhone. This equation represents the tax (22) subtracted from the retail price (x) resulting in the total price of the iPhone.

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• 40.

### Yesterday a total of 28 students were present in fourth period class. There were 2 fewer boys than twice the number of girls. Which system of equations can be used to find g. the number of girlss who were present in the fourth period class yesterday, and b, the number of boys who were present?

• A.

G + b = 28 and b = 2g + 2

• B.

G + b = 28 and b = 2g - 2

• C.

G + b = 28 and g = 2b + 2

• D.

G + b = 28 and g = 2b - 2

B. G + b = 28 and b = 2g - 2
Explanation
The given answer is correct because the problem states that there were 2 fewer boys than twice the number of girls. This can be represented by the equation b = 2g - 2, where b represents the number of boys and g represents the number of girls. Additionally, the problem states that a total of 28 students were present, which can be represented by the equation g + b = 28. Therefore, the correct system of equations to find g and b is g + b = 28 and b = 2g - 2.

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• 41.

### Which one of the following expressions is equivalent to the expression below? 2(4x – 4) + 4(2x – 2)

• A.

16x - 16

• B.

X

• C.

16x

• D.

16x + 16

A. 16x - 16
Explanation
The expression 2(4x - 4) simplifies to 8x - 8, and the expression 4(2x - 2) simplifies to 8x - 8. Therefore, when we add these two simplified expressions together, we get (8x - 8) + (8x - 8) which simplifies to 16x - 16.

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