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2 years ago

Help me if youre my friend

Mathematics

2 answers:

pav-90 [236]2 years ago

7 0

Can't say I'm your friend but anyways the answer is 200

Elena-2011 [213]2 years ago

3 0

I think it would be 200. if u are asking for prediction. 5 multiply by 200 gives 1000. That gives about half of what 200 it multiplied by 13.

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How do you find the equation of a line with Guassian elimination given two points?

Paraphin [41]

Answer:

The solution is similar to the 2-point form of the equation for a line:

y = (y2 -y1)/(x2 -x1)·x + (y1) -(x1)(y2 -y1)/(x2 -x1)

Step-by-step explanation:

Using the two points, write two equations in the unknowns of the equation of the line.

For example, you can use the equation ...

y = mx + b

Then for the points (x1, y1) and (x2, y2) you have two equations in m and b:

b + (x1)m = (y1)

b + (x2)m = (y2)

The corresponding augmented matrix for this system is ...

$\left[\begin{array}{cc|c}1&x1&y1\\1&x2&y2\end{array}\right]$

____

The "b" variable can be eliminated by subtracting the first equation from the second. This puts a 0 in row 2 column 1 of the matrix, per Gaussian Elimination.

0 + (x2 -x1)m = (y2 -y1)

Dividing by the value in row 2 column 2 gives you the value of m:

m = (y2 -y1)/(x2 -x1)

This value can be substituted into either equation to find the value of b.

b = (y1) -(x1)(y2 -y1)/(x2 -x1) . . . . . substituting for m in the first equation

7 0

2 years ago

What is the definition of similar figures

lara31 [8.8K]

Answer:

Figures are objects that have the same shape, but may have different sizes.

6 0

2 years ago

Raj is visiting the United States and needs to convert 2000 rupees to US dollars

Stells [14]

Answer:

After converting Raj will have $31.88 USD

Step-by-step explanation:

1 unit rupee = 0.01594 USD

It is given that,

Raj is visiting the United States and needs to convert 2000 rupees to US dollars

Convert 2000 rupees to USD

To find USD we have to multiply rupees with 0.01594

USD = 2000*0.01594

USD = $31.88

Therefore Raj will have $31.88 USD

7 0

3 years ago

Read 2 more answers

Dy/dx = 2xy^2 and y(-1) = 2 find y(2)

Anarel [89]

If you're using the app, try seeing this answer through your browser: brainly.com/question/2887301

—————

Solve the initial value problem:

dy
——— = 2xy², y = 2, when x = – 1.
dx

Separate the variables in the equation above:

$\mathsf{\dfrac{dy}{y^2}=2x\,dx}\\\\
\mathsf{y^{-2}\,dy=2x\,dx}$

Integrate both sides:

$\mathsf{\displaystyle\int\!y^{-2}\,dy=\int\!2x\,dx}\\\\\\
\mathsf{\dfrac{y^{-2+1}}{-2+1}=2\cdot \dfrac{x^{1+1}}{1+1}+C_1}\\\\\\
\mathsf{\dfrac{y^{-1}}{-1}=\diagup\hspace{-7}2\cdot \dfrac{x^2}{\diagup\hspace{-7}2}+C_1}\\\\\\
\mathsf{-\,\dfrac{1}{y}=x^2+C_1}$

$\mathsf{\dfrac{1}{y}=-(x^2+C_1)}$

Take the reciprocal of both sides, and then you have

$\mathsf{y=-\,\dfrac{1}{x^2+C_1}\qquad\qquad where~C_1~is~a~constant\qquad (i)}$

In order to find the value of C₁ , just plug in the equation above those known values for x and y, then solve it for C₁:

y = 2, when x = – 1. So,

$\mathsf{2=-\,\dfrac{1}{1^2+C_1}}\\\\\\
\mathsf{2=-\,\dfrac{1}{1+C_1}}\\\\\\
\mathsf{-\,\dfrac{1}{2}=1+C_1}\\\\\\
\mathsf{-\,\dfrac{1}{2}-1=C_1}\\\\\\
\mathsf{-\,\dfrac{1}{2}-\dfrac{2}{2}=C_1}$

$\mathsf{C_1=-\,\dfrac{3}{2}}$

Substitute that for C₁ into (i), and you have

$\mathsf{y=-\,\dfrac{1}{x^2-\frac{3}{2}}}\\\\\\
\mathsf{y=-\,\dfrac{1}{x^2-\frac{3}{2}}\cdot \dfrac{2}{2}}\\\\\\
\mathsf{y=-\,\dfrac{2}{2x^2-3}}$

So y(– 2) is

$\mathsf{y\big|_{x=-2}=-\,\dfrac{2}{2\cdot (-2)^2-3}}\\\\\\
\mathsf{y\big|_{x=-2}=-\,\dfrac{2}{2\cdot 4-3}}\\\\\\
\mathsf{y\big|_{x=-2}=-\,\dfrac{2}{8-3}}\\\\\\
\mathsf{y\big|_{x=-2}=-\,\dfrac{2}{5}}\quad\longleftarrow\quad\textsf{this is the answer.}$

I hope this helps. =)

Tags: ordinary differential equation ode integration separable variables initial value problem differential integral calculus

7 0

3 years ago

Please help me idk this

PIT_PIT [208]

Answer:

SA=94

Step-by-step explanation:

SA= 2(4*5) + 2(4*3) + 2(5*3)

SA=2(20) + 2(12) + 2(15)

SA=40 + 24 + 30

SA=94

8 0

3 years ago