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Sedbober [7]
3 years ago
7

Find the sum of

Mathematics
1 answer:
Bad White [126]3 years ago
5 0

Answer:

Step-by-step explanation:

(2x^2-x)+(x^2+3x-1)

2x^2-x+x^2+3x-1

x^2+3x-1

5x^2+2x-1+(4x^2-x+2)

5x^2+2x-1+4x^2+x-2

9x^2+6x-3

(3x^2+2x+1)+(x^2-1)

3x^2+2x+1+x^2-1

4x^2+2x

-x^2-1+(4x^2-x)

-x^2-1+4x^2-x

3x^2-1-x

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Find the sum.<br> 2.680<br> 34.200<br> +20.386
Talja [164]
Answer: 57.266

Align all the decimal point and do the operation required.


8 0
4 years ago
Read 2 more answers
In the paper airplane shown
Murrr4er [49]

Answer:

∠GHE = 55°

Step-by-step explanation:

ABCD is a quadrilateral (4 sided figure). We know that the sum of the interior angles (4 angles) of a quadrilateral in 360°.

Thus, A + B + C + D = 360

<em>we know b = c = 90 and a = 125, thus we can find D.</em>

<em>125 + 90 + 90 + D = 360</em>

305 + D = 360

D = 360 - 305 = 55°

<u>Note:</u> since Quadrilateral ABCD is congruent to Quadrilateral EFGH, then the measure of D is equal to measure of H (Angle GHE). Thus

∠GHE = 55°

2nd answer choice is correct

5 0
3 years ago
For all integer values of x and constant k, if (x-k)(x-5)=x^2-9x+20, what is the value of K?
amid [387]
<h3>Answer: C) 4</h3>

============================

Work Shown:

Expand out the left hand side

(x-k)(x-5)

x(x-5)-k(x-5)

x^2-5x-kx+5k

Note that the constant term here is 5k. Yes k seems like a variable, but it's actually a constant. Once we know k, we can replace it to get a fixed number. In this case, k = 4 since 5k = 5*4 = 20 to have it match with the 20 at the end of x^2-9x+20

For the x terms, we have -5x-kx = -5x-4x = -9x which matches with the middle term of x^2-9x+20

Therefore,

(x-k)(x-5) = x^2-9x+20

updates to

(x-4)(x-5) = x^2-9x+20

The -4 and -5 multiply to 20, and they also add to -9. This helps confirm we have the right k value.

4 0
4 years ago
Please help me with this!
lesya692 [45]

Answer:

x = 3

ST = 24

Step-by-step explanation:

if T is the midpoint then ST = TU

8x = 2x + 18  move like terms to the same side

8x - 2x = 18 subtract like terms

6x = 18 divide both sides by 6

x = 3 to find ST replace x with 3

5 0
3 years ago
Which of the following numbers is the smallest 0.008 or 1/3 or 0.048 or 0.36 or 1/9
Alja [10]
Ok so you have  0.008
1/3=0.33
0.048
0.36
1/9=0.11

so you tell me what u think
5 0
4 years ago
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