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3 years ago

Help please, im kind of a r3+ard T-T

Mathematics

1 answer:

Temka [501]3 years ago

7 0

Answer:

conner is my ex bf's name lol

Step-by-step explanation:

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Use the given transformation to evaluate the integral. 9 x − 3y 2x − y dA, R where R is the parallelogram enclosed by the lines

hichkok12 [17]

$\displaystyle\iint_R(9x-3y)(2x-y)\,\mathrm dA$

$\begin{cases}u=x-3y\\v=2x-y\end{cases}\implies\begin{cases}x=\frac{3v-u}5\\y=\frac{v-2u}5\end{cases}\implies\mathrm dA=|\det J|\,\mathrm du\,\mathrm dv$

where $J$ is the Jacobian matrix for the transformation,

$J=\begin{bmatrix}u_x&u_y\\v_x&v_y\end{bmatrix}=\begin{bmatrix}-\dfrac15&\dfrac35\\\\-\dfrac25&\dfrac15\end{bmatrix}\implies|\det J|=\dfrac15$

We have

$9x-3y=8x+x-3y=\dfrac85(3v-u)+u=\dfrac{24v-3u}5$

so that the integral is

$\displaystyle\frac1{25}\int_9^{10}\int_0^{10}(24v-3u)v\,\mathrm du\,\mathrm dv=\boxed{\frac{4051}5}$

5 0

3 years ago

Just curious, I want to see who can get this. tooooootttalllllly know it already

Aneli [31]

Answer:

yea that makes sense

It literally tells you how to do it

Is it some kind of proof tho? Like the math makes sense but like I've never heard of this thing.

3 0

3 years ago

If you flip a coin 90 times, how many times would you expect to land on tails?

GarryVolchara [31]

Answer:

It would be expected to land on tails 45 times.

Step-by-step explanation:

If there is a 50% chance to land on tails, about half of the time it would land on heads.

5 0

3 years ago

87.5% of what number is 49?

kozerog [31]

Answer=56

87.5%*y=49
.875y=49
____ ___
.875 .875
divide both sides by .875
y=56

7 0

3 years ago

8. 2x2 + 3x when x = 3

chubhunter [2.5K]

Answer:

Step-by-step explanation:

Substitute x = 3 into the expression

2(3)² + 3(3) = 2(9) + 9 = 18 + 9 = 27

4 0

3 years ago

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