3 years ago

18 p please help me!

Mathematics

1 answer:

nevsk [136]3 years ago

7 0

It should be the second one

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A mother is three times as old as her son, and in 11 years she will be just twice his age. Find their present ages.

brilliants [131]

The mother is 33 years old and the child is 11 because if you divide 33 by 11 you will get 3. Then if you add 11 to both ages you will get 44 for the mother and 22 for the child. Finally you divide 44 by 22 to get 2.

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3 years ago

Write these numbers in order from greatest to least 3/4 0.09 2/5 0.5 1/3

stepladder [879]

Answer:

The numbers in order from greatest to least is

3/4, 0.5, 2/5, 1/3, 0.09

Step-by-step explanation:

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3 years ago

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A Bernoulli differential equation is one of the form dxdy+P(x)y=Q(x)yn Observe that, if n=0 or 1, the Bernoulli equation is line

aleksandr82 [10.1K]

It's unclear whether the ODE is

$xy'+y=4xy^2$

$xy+y'=4xy^2$

If the first case, then divide through both sides by $y^2$ to get

$xy^{-2}y'+y^{-1}=4x$

then substitute $z=y^{-1}$ , so that $z'=-y^{-2}y'$ . Then

$-xz'+z=4x\implies-\dfrac1xz'+\dfrac1{x^2}z=\left(-\dfrac1xz\right)'=\dfrac4x$

$\implies-\dfrac1xz=\displaystyle\int\frac4x\,\mathrm dx$

$\implies z=-4x\ln|x|+Cx$

$\implies\boxed{y=\dfrac1{Cx-4x\ln|x|}}$

If the second, then dividing through by $y^2$ gives

$xy^{-1}+y^{-2}y'=4x$

The same substitution as before gives

$xz-z'=4x\implies e^{-x^2/2}z'-xe^{-x^2/2}z=\left(e^{-x^2/2}z\right)'=-4xe^{-x^2/2}$

$\implies e^{-x^2/2}z=\displaystyle-4\int xe^{-x^2/2}\,\mathrm dx$

$\implies z=4+Ce^{x^2/2}$

$\implies\boxed{y=\dfrac1{4+Ce^{x^2/2}}}$

5 0

3 years ago

Use the equation n= b-4 to find the value of n when b=9

Valentin [98]

Put 9 in for b

N=9-4

N=5

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3 years ago

93 divided by 3 using repeated subtraction

Naily [24]

93/3=31 Answer is 31

8 0

3 years ago

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