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o-na [289]
3 years ago
7

The perimeter of an irregular shape with 4

Mathematics
1 answer:
sdas [7]3 years ago
4 0

Answer:

9

Step-by-step explanation:

Three sides are

  • 4cm
  • 2cm
  • 6cm

Let other side be x

\rm \mapsto \: x + 4 + 2 + 6 = 21 \\ \rm \mapsto \: x + 6 + 6 = 21 \\   \rm \mapsto \: x + 12 = 21 \\  \rm \mapsto \: x = 21 - 12 \\  \rm \mapsto \: x = 9

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The region in the first quadrant bounded by the x-axis, the line x = ln(π), and the curve y = sin(e^x) is rotated about the x-ax
charle [14.2K]
First, it would be good to know that the area bounded by the curve and the x-axis is convergent to begin with.

\displaystyle\int_{-\infty}^{\ln\pi}\sin(e^x)\,\mathrm dx

Let u=e^x, so that \mathrm dx=\dfrac{\mathrm du}u, and the integral is equivalent to

\displaystyle\int_{u=0}^{u=\pi}\frac{\sin u}u\,\mathrm du

The integrand is continuous everywhere except u=0, but that's okay because we have \lim\limits_{u\to0^+}\frac{\sin u}u=1. This means the integral is convergent - great! (Moreover, there's a special function designed to handle this sort of integral, aptly named the "sine integral function".)

Now, to compute the volume. Via the disk method, we have a volume given by the integral

\displaystyle\pi\int_{-\infty}^{\ln\pi}\sin^2(e^x)\,\mathrm dx

By the same substitution as before, we can write this as

\displaystyle\pi\int_0^\pi\frac{\sin^2u}u\,\mathrm du

The half-angle identity for sine allows us to rewrite as

\displaystyle\pi\int_0^\pi\frac{1-\cos2u}{2u}\,\mathrm du

and replacing v=2u, \dfrac{\mathrm dv}2=\mathrm du, we have

\displaystyle\frac\pi2\int_0^{2\pi}\frac{1-\cos v}v\,\mathrm dv

Like the previous, this require a special function in order to express it in a closed form. You would find that its value is

\dfrac\pi2(\gamma-\mbox{Ci}(2\pi)+\ln(2\pi))

where \gamma is the Euler-Mascheroni constant and \mbox{Ci} denotes the cosine integral function.
5 0
3 years ago
How many different three-digit numbers between 100 and 1,000 have 5 as the tens digit?
Trava [24]
Those are the ones that are in 50s or
50,51,52,53,54,55,56,57,58,59
10 numbers per hundred

150
250
350
450
550
650
750
850
950


9 of the hundreds
10 per each
9 times 10=90

so there are 90 of them

6 0
3 years ago
Simplify ((–3)^2)^3 <br><br><br> A. (–3)^6 <br> B. (3)^6 <br> C. (3)^5 <br> D. (–3)^5
makkiz [27]

Answer:

A and B

Step-by-step explanation:

using the law of exponents

• (a^m)^{n} = a^{mn}, hence

((-3)^2)^{3} = (-3)^{6} → A

note that (- 3)² = 9 = 3², hence

(-3)^2)^{3} = (3²)³ = (3)^{6} → B




5 0
3 years ago
Read 2 more answers
What is the greatest common factor of 48, 72 and 52?A.2B.4C.8D.16
kaheart [24]
The GCM  of 48, 72, and 52 is B.) 4
8 0
3 years ago
Read 2 more answers
Wth is -5/6 as a whole number or decimal?
andriy [413]

Answer: -0.833

Step-by-step explanation:

Calculate the approximate value.

3 0
3 years ago
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