algebra
posted 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. 18râ´ sâµ tâ¶ Ã· 3r² s t³ = ?
A. 6r²sâµt³
B. 6r²sâµt³
C. 6r²sâ´t³
D. 6r²sâ´t³
2. One day when Terry went to school the temperature outside was âˆ’15 degrees Fahrenheit. In Terryâ€™s classroom the temperature was 68 degrees Fahrenheit. How many more degrees was it inside the building than outside?
A. +53 degrees
B. âˆ’53 degrees
C. +83 degrees
D. âˆ’83 degrees
3. Simplify (2x + 3)(x âˆ’ 4) = ?
A. 2x² + 5x âˆ’ 12
B. 2x² âˆ’ 5x âˆ’ 12
C. 2x² âˆ’ 5x + 12
D. 2x² + 5x + 12
4. 7 x (âˆ’3) x(âˆ’2)² = ?
A. 48
B. âˆ’48
C. 84
D. âˆ’84
5. Simplify (3aâ´ âˆ’ 2a² + 5a âˆ’ 10) âˆ’ (2aâ´ + 4a² + 5a âˆ’ 2).
A. 5aâ´ + 4a³ + 3a² + 10a âˆ’ 12
B. aâ´ âˆ’ 4a³ âˆ’ 2a² âˆ’ 8
C. aâ´ âˆ’ 6a² âˆ’ 8
D. aâ´ + 2a² + 10a âˆ’ 12
6. If Janice purchased three 24ounce 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 âˆ’ 2) x( âˆ’2) = ?
A. 22
B. âˆ’22
C. 14
D. âˆ’14
8. Simplify (2e âˆ’ 2f )(2f + 8) = ?
A. 4ef âˆ’ 4f²
B. 4ef + 16e + 4f² + 16f
C. 4ef + 16e âˆ’ 4f² âˆ’ 16f
D. 4ef âˆ’ 16e âˆ’ 4f² âˆ’ 16f
9. The expression 12xyz âˆ’ 45 is a
A. monomial.
B. binomial.
C. trinomial.
D. constant.
10. What is the result if you divide âˆ’12x^8y^8 by 3xâ´y²?
A. âˆ’4x² yâ´
B. 4x 2yâ´
C. âˆ’4xâ´yâ¶
D. 4xâ´yâ¶
11. Simplify (x² + 16)(x² âˆ’ 16) = ?
A. xâ´ âˆ’ 32
B. xâ´ + 32
C. xâ´ âˆ’ 256
D. xâ´ + 256
12. Simplify (15x² âˆ’ 24x + 9)divided by (3x âˆ’ 3) = ?
A. 5x + 3
B. 5x âˆ’ 3
C. 5x + 13 with a âˆ’30 remainder
D. 5x âˆ’ 13 with a âˆ’30 remainder
13. If the value of b is 7, then what is the value of the expression âˆ’3b² + 25 = ?
A. 172
B. 122
C. âˆ’122
D. 17
14. Simplify (âˆ’8q³râ´s²)² = ?
A. 64q^9r^16sâ´
B. âˆ’64q^9r^16sâ´
C. âˆ’64q^6r^8sâ´
D. 64q^6r^8sâ´
15. Simplify 12 âˆ’ (âˆ’8) x 4 = ?
A. 16
B. 44
C. âˆ’20
D. 80
16. Simplify 2a²b³(4a² + 3ab² âˆ’ ab)= ?
A. 8aâ´ bâµ + 3a³ bâµ âˆ’ 2a³ bâ´
B. 8aâ´ b³ + 6a³ bâµ âˆ’ 2a³ bâ´
C. 8aâ´ b³ + 6a³ bâµ + 2a³ bâ´
D. 8aâ´ bâµ + 3a³ bâµ + 2a³ bâ´
17. Simplify (3n âˆ’ 2m)² = ?
A. 6n² âˆ’ 12mn âˆ’ 4m²
B. 9n² âˆ’ 12mn âˆ’ 4m²
C. 9n² + 12mn + 4m²
D. 9n² âˆ’ 12mn + 4m²
18. Simplify (3 x 22) divided by 6 + [28 âˆ’ (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+42)(2)
*8. C if it was (2e2f)(2f+8)
9. B
10. A or C, but too garbled
11. C if (x^2+16)(x^216) = x^4256
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 doublecheck #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.