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3 years ago

Helpppp can someone help me with this?

Mathematics

1 answer:

gavmur [86]3 years ago

4 0

The middle one because the both need dotted lines can I get a crown

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Solve the equation (1 + x²)dy +xydx= 0

Tatiana [17]

Answer:

$y=\frac{c}{\sqrt[]{x^2+1} }$

Step-by-step explanation:

(1 + x²)dy +xydx= 0

$(1+x^2)dy=-xydx\\\frac{1}{y}dy=\frac{-x}{x^2+1}dx\\$

Integrate both side

$lny=-\frac{1}{2} ln(x^2+1)+c\\y=\frac{c}{\sqrt[]{x^2+1} }$

7 0

3 years ago

Change the decimal to fraction form or mixed number form and reduce if possible 73.437

harina [27]

Answer:

73.437= 74 437/1000

Step-by-step explanation:

73.437 to fraction.

Let's acknowledge the presence of a decimal and how many digit we have after the decimal point.

Actually, the numbers after the decimal point will determine the amount of 10s to be divided with.

What I'm saying is this

73.437= 74 437/1000

In this case, 437 is a prime number

73.437= 74 437/1000

3 0

3 years ago

The U.S. Department of Housing and Urban Development publishes data on the fair market monthly rent for existing one-bedroom hou

Aleksandr [31]

Answer:

$n=(\frac{1.960(80)}{25})^2 =246.73 \approx 247$

So the answer for this case would be n=247 rounded up to the nearest integer

Step-by-step explanation:

We know that the standard deviation is :

$\sigma = 80$ represent the deviation

The margin of error is given by this formula:

$ME=z_{\alpha/2}\frac{\sigma}{\sqrt{n}}$ (a)

And on this case we have that ME =25 and we are interested in order to find the value of n, if we solve n from equation (a) we got:

$n=(\frac{z_{\alpha/2} \sigma}{ME})^2$ (b)

The critical value for 95% of confidence interval now can be founded using the normal distribution and the critical value would be $z_{\alpha/2}=1.960$ , replacing into formula (b) we got:

$n=(\frac{1.960(80)}{25})^2 =246.73 \approx 247$

So the answer for this case would be n=247 rounded up to the nearest integer

8 0

3 years ago

Please help

Svetllana [295]

The midpoint of the line segment joining points S (8,3) and T (2,-1) is (5, 1)

<h3>How to determine the midpoint of the line segment joining the points?</h3>

The points are given as:

S(8,3) and T(2,-1)

The midpoint of the line segment joining points S(8,3) and T(2,-1) is calculated as:

Midpoint = 0.5 * (x1 + x2, y1 + y2)

So, we have

Midpoint = 0.5 * (8 + 2, 3 - 1)

Evaluate the sum

Midpoint = 0.5 * (10, 2)

Evaluate the product

Midpoint = (5, 1)

Hence, the midpoint of the line segment joining points S (8,3) and T (2,-1) is (5, 1)