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svetoff [14.1K]
3 years ago
10

Write the following fractions in decimal format.Hint: The numerator goes inside the division problem and the denominator goes ou

tside the division problem.
2/4


⅞


0.25/0.625


0.06/ 0.10
Mathematics
1 answer:
guajiro [1.7K]3 years ago
6 0
2/4=0.5
7/8=0.875
0.25/0.625=0.4
0.06/0.10=0.6
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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
4 years ago
PLEASE, PLEASE, PLEASE HELP ME ITS URGENT AND I WILL GIVE BRAINLIEST TO THE FIRST CORRECT ANSWER. I HAVE A TEST TOMORROW.
Leno4ka [110]

Answer:

Step-by-step explanation:

let number of adult tickets=x

and number of student tickets=y

x+y=137   ...(1)

8x+6y=952

divide by 2

4x+3y=476   ...(2)

multiply by 3

3x+3y=411   ....(3)

(2)-(3) gives

x=65

y=137-65=72

number of adult tickets=65

number of student tickets=72

2.

let number of rose flowers =x

and number of carnation flowers=y

x+y=264

y=264-x

3.50 x+2.50y=772

multiply by 2

7x+5y=1544

7 x+5(264-x)=1544

7 x+1320-5 x=1544

2 x=1544-1320

2 x=224

x=112

y=264-112=152

number of rose flowers=112

number of carnation flowers=152

8 0
4 years ago
If 28 parrots and 79 bunnies were in the same shelter what is the rate of parrots to bunnies?
nalin [4]
Put both values into a ratio

P:B
28:79
6 0
3 years ago
Read 2 more answers
The circumference of a circle 15 pi centimetres. What is the area of the circle in terms of pi
anyanavicka [17]

Answer:

(7.5)^2 pi

Step-by-step explanation:

Circumference= pi x diameter

area= radius^2 x pi

radius= 1/2 diameter

1. find radius: 15/2= 7.5

2. square radius: (7.5)^2

3. multiply by pi: (7.5)^2 x pi

3 0
3 years ago
Read 2 more answers
Find the unknown side length for the parallelogram.
krek1111 [17]
The answer is C (10.89 m)

x * 9 = 98 m²
x = 98 ÷ 9
x = 10.888888 or 10.89 m

8 0
4 years ago
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