Algebra, please help

1.add or subtract.
(4x²+15x-3)-(-3x²+5)
A:7x²+15x-8***
B:x²+12x+2
C:x²+15x-8
D:7x²+8

2.Simplify the polynomial.
-3f²+4f-3+8f²+7f+1
A:5f²-11f+2
B:11f²+11f+2
C:5f²+11f-2
D:-5f²+11f-2***

3.Add or Subtract.
(2x²+6x+1)+(-7x²+2x-3)
A:5x²-4x-2
B:-5x²+8x-2***
C:5x²-8x+2
D:-9x²-8x+2

4:Name the coefficient in the polynomial.
4x²+3x-3
A:4,-3,-3
B:4,3
C:4,3,3***
D:-4,-3

5:how many terms are in the following polynomial?
6x⁴+3x³-2x²+15x-14
A:5***
B:4
C:3
D:2

6:in the expression -7x-5x²+5 what is the coefficient of x?
A:7
B:4
C:3
D:2***

7.write the expression using a single exponent.
2²•2^8***
A:4^10
B:2^10
C:4^16
D:2^16

8:write the expression using scientific notation.
(2.5•10⁴)(4•10³)
A:10•10^8***
B:10•10^8
C:1•10^8
D:10•10^12

9:list three different ways to write 5¹¹ as the products of two powers.Explain why all three of your expressions are equal to 5¹¹.

(5¹¹,5•5•5•5•5•5•5•5•5•5•5,5^5•5^6 all three of my extrusions are equal to 5¹¹ by having 5¹¹ of course that is equal,by putting 5•5•5•5•5•5•5•5•5•5•5 I have 11 5's which equals to 5¹¹ and I also have 5^5•5^6 which is a 5 add 5 and 6 that's 11 so that equals 5¹¹

Please correct me if I'm wrong. I'm not sure if its all right. Thank you

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  1. #2 is C, -3f^2 + 8f^2 = +5f^2

    #4 debatable point here. Coefficient usually refers to the constant in front of a variable, so the last -3 does not have a variable, thus it is a constant
    I would say: 4,3 , which makes it B

    #6, the x term is -7x, so the coefficient is -7
    which is not one of the choices.
    This question is incorrect.

    in #7, you put your *** behind the actual question
    2^2 * 2^8 = 2^10 , which is B

    #8 , in scientific notation we start with a number between 1 and 10 followed by a power of 10
    2.5*10^4 * 4*10^3
    = 10 * 10^7
    = 1.0 * 10^8 which is C

    All others are correct

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    posted by Reiny
  2. 1.A
    2.C
    3.B
    4.B
    5.A
    6.D
    7.B
    8.C
    100% :) Happy Summer!

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    posted by Kenxie
  3. Kenxie is correct got 100% thanks

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    posted by Amanda
  4. Thx Kenxie

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