math

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!!!

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asked by zumai
  1. 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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    posted by Steve

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