1 The amount of chlorophyll in a leaf changes based on outside temperature. What's the independent variable in the situation?
A. Outside temperature
B. The amount of chlorophyll in a leaf
C. The month of the year
D. The color of the leaf
2 Which expression is equivalent to 3(x – 6) + 5(x – 4)?
A. 15x2 – 38x
B. 8x – 10
C. 8x – 38
D. 9x – 22
3 7 × (–3) × (–2)2 = ?
A. –48
B. 84
C. 48
D. –84
4 Which expression is equivalent to 4x – 7 – 4y + 18 – x – y?
A. 5x – 3y + 11
B. 3x – 5y + 11
C. –2xy + 11
D. 4x – 4y + 11
5 Evaluate the expression: –(31 + 2) + 72 – (–5)2.
A. 41
B. –5
C. –40
D. –9
6 Which expression lists the three consecutive integers starting with a number x?
A. x, x + 2, x + 4
B. x, x + 1, x + 2
C. x – 1, x, x + 1
D. x + 1, x, x + 2
7 Write the phrase "the product of 19 and a number" as a mathematical expression.
A. 19 – x
B. 19x
C. 19 + x
D. 19⁄x
8 Which equation represents the distance (d) a car travels, in time (t), when driving 65 miles per hour? How far did the car travel in 3 hours?
A. t = 65d; 21.7 hours
B. t = 65d; 195 hours
C. d = 65t; 21.7 miles
D. d = 65t; 195 miles
9 Which equation represents the number of books (b) a student reads if the student reads 3 books each week (w)? How many books will the student read in 18 weeks?
A. b = 3w; 54
B. b = 3w; 18
C. w = 3b; 18
D. w = 3b; 54
10 Write the phrase "nineteen less than the quotient of a number and fifteen" as a mathematical expression.
A. x⁄15 – 19
B. x⁄15 + 19
C. x⁄19 – 15
D. 15⁄x – 19
Answers
1. Since the amount of chlorophyll in a leaf depends on outside temperature, outside temperature is independent variable. (option A)
2. On simplifying, 3(x-6) + 5(x-4) = 3x - 18 + 5x - 20 = 8x -38 (option C)
3. 7*(-3)*(-2)² = - 7*3*2*2 = -21*4 = -84 (option D)
4. 4x – 7 – 4y + 18 – x – y = 4x-x -4y-y-7+18 = 3x-5y+11 (option B)
5. –(31 + 2) + 72 – (–5)² = -(29)+72 - (25)
= -29+72-25
= 18
6. If firt number is x, others will be x+1 and x+2 (option B)
7. Product is 19*x (option B)
8. distance =speed*time So d=65*t = 65*3 = 195 mile (option D)
9.Number of books = books read per week * number of weeks
So, b=3*w = 3*18 = 54 (option A)
10. According to problem, it is x/15 - 19 (option A)
1. Since the amount of chlorophyll in a leaf depends on outside temperature, outside temperature is independent variable. (option A)
2. On simplifying, 3(x-6) + 5(x-4) = 3x - 18 + 5x - 20 = 8x -38 (option C)
3. 7*(-3)*(-2)² = - 7*3*2*2 = -21*4 = -84 (option D)
4. 4x – 7 – 4y + 18 – x – y = 4x-x -4y-y-7+18 = 3x-5y+11 (option B)
5. –(31 + 2) + 72 – (–5)² = -(29)+72 - (25)
= -29+72-25
= 18
6. If firt number is x, others will be x+1 and x+2 (option B)
7. Product is 19*x (option B)
8. distance =speed*time So d=65*t = 65*3 = 195 mile (option D)
9.Number of books = books read per week * number of weeks
So, b=3*w = 3*18 = 54 (option A)
10. According to problem, it is x/15 - 19 (option A)