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iris [78.8K]
3 years ago
15

Integrate by parts or trig substition integral or anti derivative of dy/(y^2-16)

Mathematics
1 answer:
Lera25 [3.4K]3 years ago
4 0

The simplest method probably would be to split up the integrand into partial fractions.

\dfrac1{y^2-16}=\dfrac18\left(\dfrac1{y-4}-\dfrac1{y+4}\right)

Then

\displaystyle\int\frac{\mathrm dy}{y^2-16}=\frac18\left(\int\frac{\mathrm dy}{y-4}+\int\frac{\mathrm dy}{y+4}\right)=\frac18\left(\ln|y-4|-\ln|y+4|\right)+C

=\dfrac18\ln\left|\dfrac{y-4}{y+4}\right|+C

=\ln\sqrt[8]{\left|\dfrac{y-4}{y+4}\right|}+C

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Element X decays radioactively with a half life of 11 minutes. If there are 870 grams
exis [7]

Answer:

27.5 minutes

Step-by-step explanation:

Using,

R/R' = 2ᵃ/ᵇ------------------ Equation 1

From the equation,

R = mass of Element X before radioactive decay, R' = mass of element X after radioactive decay, a = Time taken, b = half life.

Given: R = 870 grams, R' = 154 grams, b = 11 minutes.

Substitute these values into equation 1

870/154 = 2ᵃ/¹¹

(870/154)¹¹ = 2ᵃ

Solve for a

2ᵃ = (5.649)¹¹

2ᵃ = 187061.26

Taking the logarithm of both side,

Log2ᵃ = Log(187061.26)

⇒ a = log(187061.26)/log2

a = 8.272/0.301

a = 27.5 minutes

5 0
2 years ago
2.5 ( y + ⅖ ) = -13<br> im really bad at math someone pls help
My name is Ann [436]

Answer:

-5.6

Step-by-step explanation:

first distribute the 2.5

also convert the 2/5 to decimal (0.4) because it's hard to work with both decimal and fraction

2.5y + 2.5*0.4 = -13

2.5y +1 = -13

y = -14/2.5 = -5.6

5 0
3 years ago
Just once i would like math to solve it's own problems,<br> i ain't no therapist.
Artyom0805 [142]

Answer:

brainly.com/question/22779054 PLEASE HELP ME

Step-by-step explanation:

5 0
2 years ago
The ratio of boys to girls in WIN is 2:3. If there are 8 boys how many girls are there
IRISSAK [1]

If there is 8 boys then there is 12 girls because 2x4=8 boys so 3x4=12 girls.

4 0
2 years ago
Five Cs Bank issues credit cards to its customers. In the past 3.4% of the out-of-state nonfraudulent credit card transactions w
kolezko [41]

Answer:

0.0838 (8.62%)

Step-by-step explanation:

defining the event G= an out-of-state transaction took place in a gasoline station , then the probability is

P(G) = probability that the transaction is fraudulent * probability that took place in a gasoline station given that is fraudulent + probability that the transaction is not fraudulent * probability that took place in a gasoline station given that is not fraudulent =  0.033 * 0.092 + 0.977 * 0.034 = 0.0362

then we use the theorem of Bayes for conditional probability. Defining also the event F= the transaction is fraudulent  , then

P(F/G)=P(F∩G)/P(G) =  0.033 * 0.092 /0.0362 =  0.0838 (8.62%)

where

P(F∩G)= probability that the transaction is fraudulent and took place in a gasoline station

P(F/G)= probability that the transaction is fraudulent given that it took place in a gasoline station

7 0
2 years ago
Read 2 more answers
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