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Helen [10]
3 years ago
5

Evaluateeee????????????

Mathematics
2 answers:
andreev551 [17]3 years ago
8 0
The answer is 15. just replace the letters with the numbers they're equal to.
amid [387]3 years ago
4 0
3x^2 - 2xy + 4y^2 ; x = -1 , y = -2
3(-1)^2 - 2(-1)(-2) + 4(-2)^2
3(1) - 4 + 16
3 - 4 + 16
-1 + 16
15

The answer is c) 15
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A fluid has density 860 kg/m3 and flows with velocity v = z i + y2 j + x2 k, where x, y, and z are measured in meters and the co
ehidna [41]

You can use the divergence theorem:

\vec v=z\,\vec\imath+y^2\,\vec\jmath+x^2\,\vec k

has divergence

\mathrm{div}\vec v=\dfrac{\partial z}{\partial x}+\dfrac{\partial y^2}{\partial y}+\dfrac{\partial x^2}{\partial z}=2y

Then the rate of flow out of the cylinder (call it <em>R</em>) is

\displaystyle\iint_{\partial R}\vec v\cdot\mathrm d\vec S=\iiint_R\mathrm{div}\vec v\,\mathrm dV

(by divergence theorem)

=\displaystyle2\int_0^{2\pi}\int_0^5\int_0^1r^2\sin\theta\,\mathrm dz\,\mathrm dr\,\mathrm d\theta

(after converting to cylindrical coordinates)

whose value is 0.

6 0
3 years ago
Jennifer's mother buys her 2 new storybooks every 4 months. In how many months will Jennifer have a collection of 12 books
Fiesta28 [93]
24 months

12/2=6
24/12=2
8 0
3 years ago
Write an expression for each quantity
Ira Lisetskai [31]
28) 7w
30) x/16
32) I/12
4 0
4 years ago
PLSSSS HELLLPPPPPPP How much would it cost to buy 3.4 pounds of Bartlett pears and 2.1 pounds of Concorde pears? Concorde pears
kirill [66]

Answer:

$13.10

Step-by-step explanation:

Concard    $3.00  2.1    $6.30

Osband    $3.00  

Green Anjou  $4.00  

Bartlett          $2.00  3.4     $6.80

Red Anjou  $5.00  

                TOTAL =      $13.10

5 0
3 years ago
Which statement follows from the given theorem? Theorem: The diagonal of a parallelogram divides it into two congruent triangles
Ivenika [448]

Answer:

SSS

Step-by-step explanation:

the dividing line would give the triangles the same length for one side, the side it divided, and then it says the triangles are congruent, meaning they are both the same triangle.

8 0
4 years ago
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