Asked by Tori

1. What are the coefficients in the polynomial 5x^2 + 2x - 4?
A. 5,2
B. -5,2
C. 5,2,-4 **
D. 5,-2,-4

For questions 2 and 3 add or subtract.
2. (m^2 - m - 4) + (m - 5)
A. m^2 - 2m + 9
B. m^2 + 2m - 9
C. m^2 - 2m - 9 **
D. m^2 - 9

3. (5x^2 + x - 3) - (-2x^3 + 4)
A. -2x^3 + 5x^2 + x - 7
B. -2x^3 + 5x^2 + x - 1
C. 2x^3 + 5x^2 + x - 7
D. 2x^3 + 5x^2 + x + 1 **

4. x^16/x^3 (this is a fraction not dividing)
A.x^16/3
B. x^48
C. x^19 **
D. x^13

5. Which of the following expressions is true?
A. 4^3 x 4^5 < 4^12 **
B. 5^2 x 5^3 > 5^5
C. 3^2 x 3^4 = 3^2
D. 5^2 x 5^4 = 5^8

6. Which of the following expressions is true?
A. 2^4 x 2^3 = 2^12
B. 3^3 x 3^6 > 3^8 **
C. 4^2 x 4^2 > 4^4
D. 5^5 x 5^2 = 5^10

For question 7, multiply. Write the result in scientific notation.
7. (2.3 x 10^1)(7 x 10^6)
A. 1.61 x 10^7
B. 1.61 x 10^8
C. 9.3 x 10^6 **
D. 9.3 x 10^7

For questions 8-10, simplify the expression.
8. -6(6x - 7)
A. -6x^2 + 7x
B. 5x^2 - 6x
C. 6x + 7x
D. -6x - 7x **

9. (2k + 1) (k - 4)
A. 2k^2 - 7k + 4 **
B. 2k^2 - 3k + 4
C. 2k^2 + 9k + 4
D. 2k^2 - 7k - 4

10. (-2y +5)(y + 3)
A. -2y^2 + 8y + 15
B. -2y^2 - y + 15
C. 2y^2 + 8y + 8
D. 2y^2 - y + 8 **

Please help! I know it's a lot but it would be greatly appreciated !!
** = the answer I chose

Answers

Answered by bobpursley
Wondering if you did these in your head.
You missed 2,3,4,7,9,10
one number 8, something is wrong with the typed problem, it makes no sense.
Answered by Tori
Sorry!! 8. is supposed to be -x(6x - 7)
Answered by bobpursley
8) -6x^2+7x
Answered by Tori
2. A
3. C
4. B
7. B
9. D
10. A

Are these right?

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