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zloy xaker [14]
4 years ago
12

Please answer this multiple choice question correctly for 30 points and brainliest!!

Mathematics
2 answers:
skelet666 [1.2K]4 years ago
5 0

Answer:

  C.  6x² -2x -1

Step-by-step explanation:

You want the sum of ...

  (5x² -8x +2) + (2x² -3x -7) - (x² -9x -4)

Eliminating parentheses gives ...

  5x² -8x +2 +2x² -3x -7 -x² +9x +4

Grouping like terms, we have ...

  (5x² +2x² -x²) + (-8x -3x +9x) + (2 -7 +4)

Then combining like terms gives ...

  6x² -2x -1 . . . . matches choice C

Kay [80]4 years ago
4 0

Answer:

The answer is C.

Step-By-Step Explanation:

Once you combine the like terms of 5x^2-8x-7 and 2x^2-3x-7 you get 7^2-11x-5. Then you need to subtract x^2-9x-4 from 7^2-11-5x. Then you will get the answer which is C.

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Find the surface area of the cylinder. Round your answer to the nearest tenth.
kirill [66]

Given:

Height of cylinder = 12 cm

Diameter of cylinder = 6 cm

To find:

Surface area of the cylinder

Solution:

Radius = 6 ÷ 2 = 3 cm

Surface area formula:

SA=2\pi r^2+2 \pi rh

Substitute the given values.

SA=2\times3.14 \times3^2+2\times3.14 \times3  \times12

     =56.52+226.08

     = 286.2 cm²

The surface area of the cylinder is 286.2 cm².

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3 years ago
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3 years ago
What is the multiplicative inverse of -8?
KiRa [710]
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5 0
3 years ago
Read 2 more answers
Use long division to determine the decimal equivalent of 5 over 9. 0 point 3 bar 0 point 4 bar 0 point 5 bar 0 point 6 bar
LenaWriter [7]

Answer:

Option 3 - 0 point 5.

Step-by-step explanation:

Given : Decimal equivalent of 5 over 9.

To find : Use long division to determine the decimal?

Solution :

We have to divide 5 by 9,

Step 1 - Divide 5 by 9 as it is not divisible put a decimal and 0 after 5,

Step 2 - Now, divide 50 by 9 the quotient is 5 and remainder is 5.

Step 3 - Again put 0 and divide the number repeat the process until the remainder is not zero.

We have done the calculation up to 3-decimal place.

So, \frac{5}{9}=0.555

Approximately, \frac{5}{9}=0.5

So, Option 3 is correct.

Refer the attached figure for calculation.

5 0
4 years ago
Which shows the four-term polynomial and factored form of x^2+6x-27
fgiga [73]
We need to understand that the sign of your constant )that's your number -27) dictates how you factor. A + and - number multipled together yields a - number.

The middle term dictates what number is asigned the + or - signs. Knowing that are 6 is positive, the larger number will be assigned the positive sign.

So what to numbers multiply together to yield- 27, but have a difference of +6. +9 x -3 = -27

Therefore, we break our binomial up as follows, (x+9)(x-3)
5 0
4 years ago
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