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zimovet [89]
3 years ago
9

HELPPPPPPPPPPPPPPPPPPPPP!!!!!!!!

Mathematics
1 answer:
Vlada [557]3 years ago
4 0

Answer:

i belive it was 750.

Step-by-step explanation:

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∫<img src="https://tex.z-dn.net/?f=%5Cfrac%7Bxdx%7D%7B%28x%5E%7B2%7D%2B4%29%5E%7B3%7D%20%7D" id="TexFormula1" title="\frac{xdx}{
photoshop1234 [79]

Substitute u=x^2+4 and du=2x\,dx. Then the integral transforms to

\displaystyle \int \frac{x\,dx}{(x^2+4)^3} = \frac12 \int \frac{du}{u^3}

Apply the power rule.

\displaystyle \int \frac{du}{u^3} = -\dfrac1{2u^2} + C

Now put the result back in terms of x.

\displaystyle \int \frac{x\,dx}{(x^2+4)^3} = \frac12 \left(-\dfrac1{2u^2} + C\right) = -\dfrac1{4u^2} + C = \boxed{-\dfrac1{4(x^2+4)^2} + C}

3 0
2 years ago
2x + 3y = 51<br>- x+2y = 8) substitution method​
Free_Kalibri [48]

Answer:

Step-by-step explanation:

2x + 3y = 51........(1)

- x+2y = 8...........(2)

Making x as subject in equation (2)

-x = -2y + 8

x = 2y - 8.........(3)

Substituting (3) in (1)

2(2y - 8) + 3y = 51

4y - 16 + 3y = 51

Collecting like terms

4y + 3y = 51 + 16

7y = 67

y = 67/7

y = 9 4/7

And x = 2y - 8

x = 2(67/7) - 8

x = 134/7 - 8

x = (134 - 56)/7

x = 78/7

x = 11 1/7

7 0
3 years ago
Ughhhh helllppp? Thanks...
dybincka [34]
A.)

v = 400d
d = v ÷ 400

b.)

<u>d __  v
</u>1, 400<u>
</u>2, 800
3, 1200
<u />
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4 years ago
Find the value of x. Round your answer to the nearest tenth
NISA [10]

Hope you enjoy  :)))))))

6 0
3 years ago
Help!’!!!!!!!!! And thanksss
dusya [7]
Hi! so in order to do this problem, you need to figure out what percent 76 is of 80. you can do this by dividing 76 by 80! so just do 76/80, and convert to a percent!
4 0
3 years ago
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