Math help please
posted by Delilah on .
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

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

Sure. The coefficient of x is the multiplying factor that appears on front of x.
In this case, it is 7 
Oh ok! Thanks for explaining!

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

Ur dumb no offense

Omg, who just said that?! :(

How old are you??

Get a life! @Delilah

So mean!