math

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 **

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