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Flura [38]
3 years ago
11

(2+x)dy/dx=3y need help

Mathematics
1 answer:
den301095 [7]3 years ago
5 0
(2+x) \frac{dy}{dx} =3y
\frac{1}{3y} dy= \frac{1}{2+x} dx
\int { \frac{1}{3y} } \, dy = \int { \frac{1}{2+x} } \, dx
\frac{1}{3}\ln(3y) = \ln(2+x) + C
(raise both to the power e): e^{ \frac{1}{3}\ln(3y)}=e^{\ln(k(2+x))}
(3y)^ \frac{1}{3} =k(2+x)
3y=k(2+x)^3
y= k(2+x)^3
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Answer:

a) To determine the minimum sample size we need to use the formula shown in the picture 1.

E is the margin of error, which is the distance from the limits to the middle (the mean) of the confidence interval. This means that we have to divide the range of the interval by 2 to find this distance.

E = 0.5/2 = 0.25

Now we apply the formula

n = (1.645*0.80/0.25)^2 = 27.7 = 28

The minimum sample size would be 28.

b) To answer the question we are going to make a 90% confidence interval. The formula is:

(μ - E, μ + E)

μ is the mean which is 127. The formula for E is shown in the picture.

E = 0.80*1.645/√8 = 0.47

(126.5, 127.5)

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7 0
3 years ago
What percent of 38 is 12
mars1129 [50]

Answer:

31%

Step-by-step explanation:

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8 0
2 years ago
HELP PLEASE URGENT!!!!
loris [4]
<span>Equations:
g + b + 0 = 1500
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g + b + r = 2000
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</span><span>g = 250
b = 1250
r = 500
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Happy Valentines :)</span>
4 0
3 years ago
How do I solve this properly?
o-na [289]

Answer:

x \geq 4

Step-by-step explanation:

4x^2 - 64 \geq 0 ; move 64 over

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6 0
3 years ago
9) $36,500 at 2% compounded
arsen [322]

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Step-by-step explanation:

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