Posted by **Delilah** on Monday, May 6, 2013 at 7:46pm.

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 -
**drwls**, Monday, May 6, 2013 at 7:53pm
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 -
**Delilah**, Monday, May 6, 2013 at 7:55pm
Can you explain #7 please

- Math help please -
**drwls**, Monday, May 6, 2013 at 8:01pm
Sure. The coefficient of x is the multiplying factor that appears on front of x.

In this case, it is -7

- Math help please -
**Delilah**, Monday, May 6, 2013 at 8:07pm
Oh ok! Thanks for explaining!

- Math help please -
**bella**, Wednesday, October 19, 2016 at 3:26pm
what the answer to 5x8=(5x2)+(5x

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