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Stolb23 [73]
2 years ago
8

What is the positive difference between 8 and 9

Mathematics
1 answer:
spayn [35]2 years ago
5 0

Answer:

8-9=-1

just absoulte value. |-1| = 1

Step-by-step explanation:

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Mike is cycling from the library to his home. The equation shows Mike's distance (y), in miles, from his home after x minutes: y
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"12" represents Mike's original distance from his home.  As he rides, this distance decreases by 2 miles/minute  (which is rather unlikely, as that'd be 120 mph).
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Find the volume of the solid generated when R​ (shaded region) is revolved about the given line. x=6−3sec y​, x=6​, y= π 3​, and
Dmitrij [34]

Answer:

V=9\pi\sqrt{3}

Step-by-step explanation:

In order to solve this problem we must start by graphing the given function and finding the differential area we will use to set our integral up. (See attached picture).

The formula we will use for this problem is the following:

V=\int\limits^b_a {\pi r^{2}} \, dy

where:

r=6-(6-3 sec(y))

r=3 sec(y)

a=0

b=\frac{\pi}{3}

so the volume becomes:

V=\int\limits^\frac{\pi}{3}_0 {\pi (3 sec(y))^{2}} \, dy

This can be simplified to:

V=\int\limits^\frac{\pi}{3}_0 {9\pi sec^{2}(y)} \, dy

and the integral can be rewritten like this:

V=9\pi\int\limits^\frac{\pi}{3}_0 {sec^{2}(y)} \, dy

which is a standard integral so we solve it to:

V=9\pi[tan y]\limits^\frac{\pi}{3}_0

so we get:

V=9\pi[tan \frac{\pi}{3} - tan 0]

which yields:

V=9\pi\sqrt{3}]

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Step-by-step explanation:

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Step-by-step explanation:

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