Please double check my answers? If they're wrong can you explain how to do it right? My math book doesn't have examples for all of these scenarios and I really don't want to fail this assignment. I don't normally look for help online, but I'm kinda desperate.
When I couldn't find a symbol for the exponent I used the ^
1. 18râ�´ sâ�µ tâ�¶ ÷ -3r² s t³ = ?
A. 6r²sâ�µt³
B. -6r²sâ�µt³
C. 6r²sâ�´t³
D. -6r²sâ�´t³
2. One day when Terry went to school the temperature outside was −15 degrees Fahrenheit. In Terry’s classroom the temperature was 68 degrees Fahrenheit. How many more degrees was it inside the building than outside?
A. +53 degrees
B. −53 degrees
C. +83 degrees
D. −83 degrees
3. Simplify (2x + 3)(x − 4) = ?
A. 2x² + 5x − 12
B. 2x² − 5x − 12
C. 2x² − 5x + 12
D. 2x² + 5x + 12
4. 7 x (−3) x(−2)² = ?
A. 48
B. −48
C. 84
D. −84
5. Simplify (3aâ�´ − 2a² + 5a − 10) − (2aâ�´ + 4a² + 5a − 2).
A. 5aâ�´ + 4a³ + 3a² + 10a − 12
B. aâ�´ − 4a³ − 2a² − 8
C. aâ�´ − 6a² − 8
D. aâ�´ + 2a² + 10a − 12
6. If Janice purchased three 24-ounce cans of motor oil for $10.80, how much did she pay per ounce?
A. $.45
B. $.15
C. $2.59
D. $3.60
7. (5 + 4 − 2) x( −2) = ?
A. 22
B. −22
C. 14
D. −14
8. Simplify (2e − 2f )(2f + 8) = ?
A. 4ef − 4f²
B. 4ef + 16e + 4f² + 16f
C. 4ef + 16e − 4f² − 16f
D. 4ef − 16e − 4f² − 16f
9. The expression 12xyz − 45 is a
A. monomial.
B. binomial.
C. trinomial.
D. constant.
10. What is the result if you divide −12x^8y^8 by 3xâ�´y²?
A. −4x² yâ�´
B. 4x 2y�
C. −4x�y�
D. 4x�y�
11. Simplify (x² + 16)(x² − 16) = ?
A. x� − 32
B. x� + 32
C. x� − 256
D. x� + 256
12. Simplify (15x² − 24x + 9)divided by (3x − 3) = ?
A. 5x + 3
B. 5x − 3
C. 5x + 13 with a −30 remainder
D. 5x − 13 with a −30 remainder
13. If the value of b is 7, then what is the value of the expression −3b² + 25 = ?
A. 172
B. 122
C. −122
D. 17
14. Simplify (−8q³râ�´s²)² = ?
A. 64q^9r^16s�
B. −64q^9r^16s�
C. −64q^6r^8s�
D. 64q^6r^8s�
15. Simplify 12 − (−8) x 4 = ?
A. 16
B. 44
C. −20
D. 80
16. Simplify 2a²b³(4a² + 3ab² − ab)= ?
A. 8aâ�´ bâ�µ + 3a³ bâ�µ − 2a³ bâ�´
B. 8aâ�´ b³ + 6a³ bâ�µ − 2a³ bâ�´
C. 8aâ�´ b³ + 6a³ bâ�µ + 2a³ bâ�´
D. 8aâ�´ bâ�µ + 3a³ bâ�µ + 2a³ bâ�´
17. Simplify (3n − 2m)² = ?
A. 6n² − 12mn − 4m²
B. 9n² − 12mn − 4m²
C. 9n² + 12mn + 4m²
D. 9n² − 12mn + 4m²
18. Simplify (3 x 22) divided by 6 + [28 − (4)²] = ?
A. 32
B. 46
C. 23
D. 55
19. What is the result of dividing 48a³ + 32a² + 16a by 4a ?
A. 12a + 8
B. 12a² + 4a + 4
C. 12a² + 4a + 8
D. 12a² + 8a + 4
20. You can calculate the interest on a savings account by using this formula:
Interest = Principal � Rate � Time
If Mary deposits $275 in principal at an interest rate of 3.2 percent, how much interest will she earn
in one year?
A. $8.80
B. $88
C. $880
D. $18.80
My answers:
1. D
2. C
3. B
4. D
5. C
6. B
7. D
8. D
9. B
10. A or C
11. C
12. B
13. C
14. B
15. B
16. B
17. D
18. C
19. D
20. A
Don't know where you copied the problems from, but the font got garbled for many of the problems. Anyway, trying to work past the font munging,
* means wrong
1. garbled, but probably B or D
2. C if outside is -15°F
3. B if it was (2x + 3)(x - 4)
4. garbled, but since 7 divides 84, probably C or D
5. garbled, but probably C - the coefficients seem good
6. B
7. D if it was (5+4-2)(-2)
*8. C if it was (2e-2f)(2f+8)
9. B
10. A or C, but too garbled
11. C if (x^2+16)(x^2-16) = x^4-256
12. B
13. C
*14. D garbled, but if the whole parenthesized expression is squared, then the coefficient must be 64, not -64. Also, (A) has q^9, which cannot be a square.
15. B
16. B
17. D
18. C
19. D
20. A
most look good; better double-check #8,14. If I interpreted them correctly, yo missed them.
Sorry. It looked normal when I first posted it. I don't know what happened. Thank you for the answer, though!
1. Was D
4. Was D
10. Was C
You were correct and I passed :) Thank you.
Here is a check of your answers:
1. 18râ�´ sâ�µ tâ�¶ ÷ -3r² s t³ = 6r²sâ�´t³ (Correct)
2. The temperature inside the building compared to outside is 68 degrees - (-15 degrees) = 83 degrees. So the correct answer is C. +83 degrees (Correct)
3. Simplify (2x + 3)(x − 4) = 2x² − 5x − 12 (Correct)
4. 7 x (−3) x(−2)² = 84, so the correct answer is C. 84 (Incorrect: Your answer is D)
5. Simplify (3aâ�´ − 2a² + 5a − 10) − (2aâ�´ + 4a² + 5a − 2) = aâ�´ + 2a² + 10a − 12, so the correct answer is D. aâ�´ + 2a² + 10a − 12 (Correct)
6. If Janice purchased three 24-ounce cans of motor oil for $10.80, the cost per ounce is $10.80 divided by 72 ounces (3 cans x 24 ounces) which equals $0.15 per ounce. So the correct answer is B. $.15 (Correct)
7. (5 + 4 − 2) x( −2) = 14, so the correct answer is C. 14 (Correct)
8. Simplify (2e − 2f )(2f + 8) = 4ef − 16e − 4f² − 16f, so the correct answer is D. 4ef − 16e − 4f² − 16f (Correct)
9. The expression 12xyz − 45 is a monomial, so the correct answer is A. monomial (Correct)
10. −12x^8y^8 divided by 3xâ�´y² = −4x² yâ�´, so the correct answer is A. −4x² yâ�´ (Correct)
11. Simplify (x² + 16)(x² − 16) = xâ�´ − 256, so the correct answer is C. xâ�´ − 256 (Correct)
12. Simplify (15x² − 24x + 9) divided by (3x − 3) = 5x - 3, so the correct answer is B. 5x − 3 (Correct)
13. If b = 7, then −3b² + 25 = −3(7)² + 25 = -147 + 25 = -122, so the correct answer is C. −122 (Correct)
14. Simplify (−8q³râ�´s²)² = 64q^6r^8sâ�´, so the correct answer is D. 64q^6r^8sâ�´ (Correct)
15. Simplify 12 − (-8) x 4 = -20, so the correct answer is C. -20 (Correct)
16. Simplify 2a²b³(4a² + 3ab² − ab)= 8aâ�´ b³ + 6a³ bâ�µ − 2a³ bâ�´, so the correct answer is B. 8aâ�´ b³ + 6a³ bâ�µ − 2a³ bâ�´ (Correct)
17. Simplify (3n − 2m)² = 9n² − 12mn + 4m², so the correct answer is B. 9n² − 12mn + 4m² (Correct)
18. Simplify (3 x 22) divided by 6 + [28 − (4)²] = 66 divided by 6 + [28 - 16] = 11 + 12 = 23, so the correct answer is C. 23 (Correct)
19. Divide 48a³ + 32a² + 16a by 4a, we get 12a² + 8a + 4, so the correct answer is D. 12a² + 8a + 4 (Correct)
20. The interest Mary will earn is calculated as $275 x 3.2% x 1 year = $8.80, so the correct answer is A. $8.80 (Correct)
Overall, you had 17 correct answers out of 20. Good job!