2 years ago

Do the ratios 6/1 and 18/3 forma proportion yes or no?

Mathematics

1 answer:

andrezito [222]2 years ago

4 0

I'm pretty sure it's no...

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Find the inverse for each relation {(-5,1),(-5,-1)(-5,8)}

kobusy [5.1K]

Answer:

(-5,7) (-5,8) (-5,3)

Step-by-step explanation:

Dont know if this will help but here you go

3 0

1 year ago

Yall please help!!!!!! THANK YOUUU SO MUCHHH!!! Kinda lostttt

Georgia [21]

Answer:

Should be C

Step-by-step explanation:

Only the same power number can be use to add or subtract :)

But why is A, B and C same kinda stuff?

3 0

1 year ago

Find a linear second-order differential equation f(x, y, y', y'') = 0 for which y = c1x + c2x3 is a two-parameter family of solu

Alisiya [41]

Let $y=C_1x+C_2x^3=C_1y_1+C_2y_2$ . Then $y_1$ and $y_2$ are two fundamental, linearly independent solution that satisfy

$f(x,y_1,{y_1}',{y_1}'')=0$
$f(x,y_2,{y_2}',{y_2}'')=0$

Note that ${y_1}'=1$ , so that $x{y_1}'-y_1=0$ . Adding $y''$ doesn't change this, since ${y_1}''=0$ .

So if we suppose

$f(x,y,y',y'')=y''+xy'-y=0$

then substituting $y=y_2$ would give

$6x+x(3x^2)-x^3=6x+2x^3\neq0$

To make sure everything cancels out, multiply the second degree term by $-\dfrac{x^2}3$ , so that

$f(x,y,y',y'')=-\dfrac{x^2}3y''+xy'-y$

Then if $y=y_1+y_2$ , we get

$-\dfrac{x^2}3(0+6x)+x(1+3x^2)-(x+x^3)=-2x^3+x+3x^3-x-x^3=0$

as desired. So one possible ODE would be

$-\dfrac{x^2}3y''+xy'-y=0\iff x^2y''-3xy'+3y=0$

(See "Euler-Cauchy equation" for more info)

6 0

2 years ago

Calculate the x and y-intercept for the line: y=-2x+8

Kryger [21]

x-intercept, y = 0:
-2x + 8 =0
-2x = -8
x= -8/-2 = 4

y-intercept, x =0
y = 8

3 0

2 years ago

A plane flew a total of 1920 miles at the average rate of speed of 320 mph. How long did it take the plane to cover this distanc

iren2701 [21]

Answer:

t = 6 hours

Step-by-step explanation:

D = r x t

1920 = 320t

divide both sides by 320:

t = 6 hours

4 0

2 years ago