In which step to the student first make an error and what is the correct step

Mathematics

2 answers:

Evgesh-ka [11]3 years ago

8 0

Answer:

The answer is B

Step-by-step explanation:

Hope this helps :))

sp2606 [1]3 years ago

5 0

Answer:

step 2 i believe

Step-by-step explanation:

hope this helps

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The floor of a shed has an area of 108 ft. The floor is a rectangle whose length is 6 feet less than twice the width. Find the w

Lesechka [4]

A = L x W

A = 108

108 = L x W

L = 2w - 6

108 = (2w-6) (W)

7 0

3 years ago

Find the area cut out of the cylinder x2 z2=9 by the cylinder x2 y2=9.

Digiron [165]

The cylinder is symmetric across the plane $y=0$ , so we need only consider half of the cut-out region.

This region can be parameterized by

$\mathbf r(r,\theta)=(r\cos\theta,\sqrt{9-r^2\cos^2t},r\sin\theta)$

with $0\le\theta\le2\pi$ and $0\le r\le3$ . Then the area of this half is given by the surface integral

$\displaystyle\int_{\theta=0}^{\theta=2\pi}\int_{r=0}^{r=3}\left\|\mathbf r_r\times\mathbf r_\theta\right\|\,\mathrm dr\,\mathrm d\theta$
$=\displaystyle\int_0^{2\pi}\int_0^3\frac{3r}{\sqrt{9-r^2\cos^2\theta}}\,\mathrm dr\,\mathrm d\theta$
$=36$

Doubling this gives a total area of 72.

6 0

3 years ago

What is the value of x ?enter your answer as a decimal in the box

maksim [4K]

Answer:

$x=67.5\ ft$