PLS HELP ME WITH MY GEOMETRY I WILL GIVE BRAINLYIST IF IT GIVES ME THE OPION

Mathematics

2 answers:

kobusy [5.1K]3 years ago

8 0

Answer:

the first and fourth are correct, the second and third are not correct

Step-by-step explanation:

if you plug in the numbers as x and y, then you need to see if they add up to thirteen. So you would multiply the first number in each perenthesis by two and the second by nine, and then if when you add the two of them together, it is equal to the number after the equal sign (13, in this case), you would answer yes, but if it's not, you would answer no.

Vika [28.1K]3 years ago

7 0

Answer:

the 3rd one is yes the rest are no

Step-by-step explanation:

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Find the volume of the wedge-shaped region contained in the cylinder x2 + y2 = 49, bounded above by the plane z = x and below by

fiasKO [112]

$\displaystyle\iiint_R\mathrm dV=\int_{y=-7}^{y=7}\int_{x=-\sqrt{49-y^2}}^{x=0}\int_{z=x}^{z=0}\mathrm dz\,\mathrm dx\,\mathrm dy$

Converting to cylindrical coordinates, the integral is equivalent to

$\displaystyle\iiint_R\mathrm dV=\int_{\theta=\pi/2}^{\theta=3\pi/2}\int_{r=0}^{r=7}\int_{z=r\cos\theta}^{z=0}r\,\mathrm dz\,\mathrm dr\,\mathrm d\theta$
$=\displaystyle\int_{\theta=\pi/2}^{\theta=3\pi/2}\int_{r=0}^{r=7}-r^2\cos\theta\,\mathrm dr\,\mathrm d\theta$
$=-\displaystyle\left(\int_{\theta=\pi/2}^{3\pi/2}\cos\theta\,\mathrm d\theta\right)\left(\int_{r=0}^{r=7}r^2\,\mathrm dr\right)$
$=\dfrac{2\times7^3}3=\dfrac{686}3$

4 0

3 years ago

Simplify (x^3/8)^3/4

Viktor [21]

When an exponent is raised to another exponent, you can multiply the powers to simplify them.

3/8*3/4

<em>*Multiply numerators*</em>

3*3=9

<em>*Multiply denominators*</em>

8*4=32

x^9/32

Hope this helps!!