Asked by Mittens

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. 18r⁴ s⁵ t⁶ ÷ -3r² s t³ = ?

A. 6r²s⁵t³
B. -6r²s⁵t³
C. 6r²s⁴t³
D. -6r²s⁴t³

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 (3a⁴ − 2a² + 5a − 10) − (2a⁴ + 4a² + 5a − 2).

A. 5a⁴ + 4a³ + 3a² + 10a − 12
B. a⁴ − 4a³ − 2a² − 8
C. a⁴ − 6a² − 8
D. a⁴ + 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 3x⁴y²?

A. −4x² y⁴
B. 4x 2y⁴
C. −4x⁴y⁶
D. 4x⁴y⁶

11. Simplify (x² + 16)(x² − 16) = ?

A. x⁴ − 32
B. x⁴ + 32
C. x⁴ − 256
D. x⁴ + 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 (−8q³r⁴s²)² = ?

A. 64q^9r^16s⁴
B. −64q^9r^16s⁴
C. −64q^6r^8s⁴
D. 64q^6r^8s⁴

15. Simplify 12 − (−8) x 4 = ?

A. 16
B. 44
C. −20
D. 80

16. Simplify 2a²b³(4a² + 3ab² − ab)= ?

A. 8a⁴ b⁵ + 3a³ b⁵ − 2a³ b⁴
B. 8a⁴ b³ + 6a³ b⁵ − 2a³ b⁴
C. 8a⁴ b³ + 6a³ b⁵ + 2a³ b⁴
D. 8a⁴ b⁵ + 3a³ b⁵ + 2a³ b⁴

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

Answers

Answered by Steve
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.
Answered by Anonymous
Sorry. It looked normal when I first posted it. I don't know what happened. Thank you for the answer, though!
Answered by Mittens
1. Was D
4. Was D
10. Was C

You were correct and I passed :) Thank you.
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