Posted by **zumai** on Sunday, June 1, 2014 at 11:44am.

4. What are the coefficients in the polynomial 7x^2 - 4x + 6?

A. -7, 4

B. 7, 4, -6

C. 7, -4, 6

D. 7, -4

7. Suppose you earned 6t + 2 dollars on Monday and 9t - 6 dollars on Tuesday. What were the total earnings? Simplify your answer.

A. 15t - 4

B. 15t + 8

C. -3t - 4

D. -3t + 8

15. (1.8 x 10^1)(7 x 10^5)

A. 1.26 x 10^7

B. 8.8 x 10^6

C. 8.8 x 10^5

D. 1.26 x 10^6***???

18. -x(5x - 4)

A. 4x^2 - 5x***???

B. -5x - 4x

C. 5x + 4x

D. -5x^2 + 4x

im not sure about #4 and #7

i think #15 is D. not sure...

on #18 i keep getting 4x - 5x^2

so A. is closest but i don't know why i keep getting this.

pls help asap!!!

- math -
**Steve**, Sunday, June 1, 2014 at 7:06pm
4D

coefficients require a variable. The 6 is just a constant, not a coefficient of x.

7A

Total is just the sum:

6t+2 + 9t-6 = (6+9)t+(2-6) = 15t-4

15A

(1.8 x 10^1)(7 x 10^5)

= (1.8x7)x10^(1+5)

= 12.6x10^6

= 1.26x10^7

18D

-x(5x-4)

= -x*5x -x(-4)

= -5x^2 + 4x

Look again at your answer. It is correct, but it is not A.

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