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4 years ago

URGENT PLEASE HELP!!!

Mathematics

2 answers:

Naily [24]4 years ago

7 0

15.7 feet
and you are welcome

sukhopar [10]4 years ago

4 0

Answer:

B 15.7

Step-by-step explanation:

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Jill is 18 kilometers away from Joe. Both begin to walk toward each other at the same time. Jill walks at 3 kilometers per hour.

slava [35]

Answer:

How fast is Joe walking ?

v(Joe) = 1.5km/h

Step-by-step explanation:

v = d/t => d = v·t

Jill

d = 3km/h·4h = 12 km

Joe

d = 18km - 12km = 6km

v = d/t = 6km/4h = 1.5 km/h

6 0

3 years ago

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

Please no links solve and explain it.

ankoles [38]

Don’t use that link

4 0

3 years ago

Find the degree of the polynomial.<br><br>3x^8 + 5x^4z^7 − 6z − 4

Orlov [11]

Answer:

The degree is 8.

Step-by-step explanation:

8 0

4 years ago

I need all three answers fast pls

Zigmanuir [339]

Answer:

Step-by-step explanation:

4. -3(2x + 6) = -6x - 18

5. -3x - 9= -3(x + 3)

6. 5x - 25y = 5(x - 5y)

8 0

3 years ago