Math help please

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7. In the expression –7x – 5x2 + 5, what is the coefficient of x?

7
5
–5
–7

8. Write the expression using a single exponent. 2^2 • 2^8

4^10
2^10
4^16
2^16

9. Write the expression using scientific notation. (2.5 • 104)(4 • 103)

10 • 10^7
10 • 10^8
1 • 10^8
10• 10^12

My answers:
7. 5
8. 2^10
9. 10 • 10^7

  • Math help please -

    Your #7. is wrong
    No. 9 could also be 1*10^8, but it should have two significant figures, as your answer does.

  • Math help please -

    Can you explain #7 please

  • Math help please -

    Sure. The coefficient of x is the multiplying factor that appears on front of x.

    In this case, it is -7

  • Math help please -

    Oh ok! Thanks for explaining!

  • Math help please -

    what the answer to 5x8=(5x2)+(5x

  • Math help please -

    Ur dumb no offense

  • Math help please -

    Omg, who just said that?! :(

  • Math help please -

    How old are you??

  • Math help please -

    Get a life! @Delilah

  • Math help please -

    So mean!

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