# Math

1. Simplify. 3x^2+ 5x-5x^2-4x+5-2
A.-8x^2-9x+3
B.2x^2+x+3
C.-2x^2-9x+3***
D.-2x^2+x+3

2. Add or Subtract.(8x – 2y) + (3x – 4y)
A.11x+8y
B.4x-y
C.11x-6y***
D.5x+2y

3.(5x^2-4x-1)-(-4x^2-4)
A.-9x^2-8x-1
B.9x^2-4x+3***
C.x^2-4x-3
D.9x^2+4x-3

4.The distance from Newtown to Old town on the highway is (6x^2 + 2x – 2) miles. Using the back roads, the distance is (5x^2 – 8x – 6) miles. How many miles shorter is the second route?
A.11x^2 + 10x – 8
B.–x^2 – 6x + 4
C.x^2 + 10x + 4
D.x^2 – 6x – 8
idk #4

5.write the expression using a single exponent. 7^5 times 7^6
A.49^30***
B.7^30
C.49^11
D.7^11

6. 6^a times 6^v
A.6^a+v
B.6^av
C.36^av***
D.36^a+v

7.2^8 over 2^7
A.2^1
B.2 and 8 over 7***
C.2^56
D.2^15

8.x^56 over x^24
A.x^80
B.x^23
C.x^32
D.none of these
idk #8
9.write the result in scientific notation. (9 times 10^4)(8 times 10^6)
A.7.2times 10^25
B.1.7times 10^11
C.7.2times 10^11
D.1.7times 10^25***

10.Simpify the expression. (-8x)times 3x^2
A.-5x^3
B.-24x^2
C.-24x^3
D.-5x^2
im struggling with the last three and I don't want to guess

11.(-11z)^0
A.z
B.1
C.-11
D.-1

12.14^-4
A.1 over 14^4
B.-56
C.1 over 14
D.1 over 14^4

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3. 👁 2,607
1. I pasted your original post, so I don't have to scroll up and down.
I have inserted the corrections.
If nothing is shown , then the question was correct

1. Simplify. 3x^2+ 5x-5x^2-4x+5-2
A.-8x^2-9x+3
B.2x^2+x+3
C.-2x^2-9x+3***
D.-2x^2+x+3

****** 3x^2+ 5x-5x^2-4x+5-2
= -2x^2 + x - 2
NONE of the choices, did you have a typo?

2. Add or Subtract.(8x – 2y) + (3x – 4y)
A.11x+8y
B.4x-y
C.11x-6y***
D.5x+2y

3.(5x^2-4x-1)-(-4x^2-4)
A.-9x^2-8x-1
B.9x^2-4x+3***
C.x^2-4x-3
D.9x^2+4x-3

4.The distance from Newtown to Old town on the highway is (6x^2 + 2x – 2) miles. Using the back roads, the distance is (5x^2 – 8x – 6) miles. How many miles shorter is the second route?
A.11x^2 + 10x – 8
B.–x^2 – 6x + 4
C.x^2 + 10x + 4
D.x^2 – 6x – 8
idk #4

****** (6x^2 + 2x - 2) - (5x^2 - 8x - 6)
= x^2 + 10x + 4 ----> C

5.write the expression using a single exponent. 7^5 times 7^6
A.49^30***
B.7^30
C.49^11
D.7^11

oh, my!, 49^30 is huuuuuge
7^5 * 7^6
= 7^11

6. 6^a times 6^v
A.6^a+v
B.6^av
C.36^av***
D.36^a+v
******* when multiplying powers with the same base, keep the base and add the exponents
(6^a)(6^v)
= 6^(a+v) ---> A , also see the same rule for #5

7.2^8 over 2^7
A.2^1
B.2 and 8 over 7***
C.2^56
D.2^15
**** read my rule for multiplication again. What do you think it will be for division
-----> 2^8 ÷ 2^7 = 2^1

8.x^56 over x^24
A.x^80
B.x^23
C.x^32
D.none of these
idk #8
****** same rule as #7
x^56 ÷ x^24 = x^32 -----> C

9.write the result in scientific notation. (9 times 10^4)(8 times 10^6)
A.7.2times 10^25
B.1.7times 10^11
C.7.2times 10^11
D.1.7times 10^25***
****** (9 x 10^4)(8 x 10^6)
= 72 x 10^10
= 7.2 x 10^11 ------> C

10.Simpify the expression. (-8x)times 3x^2
A.-5x^3
B.-24x^2
C.-24x^3
D.-5x^2
im struggling with the last three and I don't want to guess
******
(-8x)(3x^2) = -24 x^3
can you see what I did ?

11.(-11z)^0
A.z
B.1
C.-11
D.-1
***** (anything)^0 = 1
so (-11z)^0 = 1 ---->B

12.14^-4
A.1 over 14^4
B.-56
C.1 over 14
D.1 over 14^4
****** rule: a^-n = 1/a^+n
14^-4
= 1/14^4 ----> A

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2. 1B
2D
3C
4B
5C
6D
7A
8A
9C
10C
11B
12C
13B
14A
These are 1000000000000000000000000000% right i swear

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2. 👎 1
3. Nun Yan is Right! Thank you!

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4. @Nun yah is correct!

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5. i'm only a 6th grader helping my sister ^w^

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6. IM A 6TH GRADER WHAT

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7. Nun yah is right! He/she is right for the Polynomials and Properties of Exponents Review Practice!

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2. 👎 0
8. nun yuh is right :)

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9. Mine aren't in that order

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2. 👎 0

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