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SpyIntel [72]
3 years ago
5

(BRAINLIEST)

Mathematics
2 answers:
mr_godi [17]3 years ago
5 0
Ne
NaCI I’m not sure if that is the correct answer
3241004551 [841]3 years ago
3 0

Answer:

C) NaCl

Step-by-step explanation:

by definition, a chemical compound is a chemical substance consisting of two or more different chemically bonded chemical elements.

the only choice with "two or more different chemically bonded chemical elements"  is NaCl (sodium and calcium)

The rest are comprised of only a single element.

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Use the given transformation x=4u, y=3v to evaluate the integral. ∬r4x2 da, where r is the region bounded by the ellipse x216 y2
exis [7]

The Jacobian for this transformation is

J = \begin{bmatrix} x_u & x_v \\ y_u & y_v \end{bmatrix} = \begin{bmatrix} 4 & 0 \\ 0 & 3 \end{bmatrix}

with determinant |J| = 12, hence the area element becomes

dA = dx\,dy = 12 \, du\,dv

Then the integral becomes

\displaystyle \iint_{R'} 4x^2 \, dA = 768 \iint_R u^2 \, du \, dv

where R' is the unit circle,

\dfrac{x^2}{16} + \dfrac{y^2}9 = \dfrac{(4u^2)}{16} + \dfrac{(3v)^2}9 = u^2 + v^2 = 1

so that

\displaystyle 768 \iint_R u^2 \, du \, dv = 768 \int_{-1}^1 \int_{-\sqrt{1-v^2}}^{\sqrt{1-v^2}} u^2 \, du \, dv

Now you could evaluate the integral as-is, but it's really much easier to do if we convert to polar coordinates.

\begin{cases} u = r\cos(\theta) \\ v = r\sin(\theta) \\ u^2+v^2 = r^2\\ du\,dv = r\,dr\,d\theta\end{cases}

Then

\displaystyle 768 \int_{-1}^1 \int_{-\sqrt{1-v^2}}^{\sqrt{1-v^2}} u^2\,du\,dv = 768 \int_0^{2\pi} \int_0^1 (r\cos(\theta))^2 r\,dr\,d\theta \\\\ ~~~~~~~~~~~~ = 768 \left(\int_0^{2\pi} \cos^2(\theta)\,d\theta\right) \left(\int_0^1 r^3\,dr\right) = \boxed{192\pi}

3 0
2 years ago
AB = 4 - 5x and BC = 2x+ 25 <br> X= 7
elena-14-01-66 [18.8K]

Answer:

x= - AB-4/5 and No Solution

False for all xER

Step-by-step explanation:

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3 years ago
6(2x-1) over 5. I need help so help me pleeease
pav-90 [236]

Answer:

(12x - 6)/5

Step-by-step explanation:

6(2x-1)/5 => (12x - 6)/5 because of the distributive property.

You cannot simplify farther after you reach (12x - 6)/5.

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3 years ago
Alicia’s family wants to save for a four-year college education for her. After some research, they estimate that the total cost
erma4kov [3.2K]

Answer:

Step-by-step explanation:

$1,100

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3 years ago
How do you find the slope of a point
Hoochie [10]
A point doesn't have slope. Once you have TWO points, then the line between them has a slope. The slope is (how far the line rises from one point to the other) divided by (the level distance between them).
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