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2 years ago

Pls Help me I need it

Mathematics

1 answer:

ad-work [718]2 years ago

4 0

Answer:

${2}^{7}$

Step-by-step explanation:

${2}^{7} = 128$

${7}^{2} = 49$

So,

$128 > 49 \\ {2}^{7} \: \: \: \: > {7}^{2}$

Therefore 2^7 is greater

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Determine whether the graphs of any of the following equations are parallel or perpendicular. Explain

bixtya [17]

Answer:

y=4x and x+4y=12 are perpendicular because they have opposite reciprocal slopes

Step-by-step explanation:

y=4x slope is 4

x+4y=12 slope is -1/4

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2 years ago

13. The manager of a landscaping company collected data for an entire summer. Before each job he completely filled the gasoline

nadya68 [22]

Answer:

Before you get started, take this readiness quiz.

Write as an inequality: x is at least 30.

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2 years ago

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Question 27 <br> twice a number x added to another number y gives 35 <br><br> how ??

kenny6666 [7]

Answer:

y+2x=35

so how to get that answer if you divided 35/2= 17.5 so 17 *2= 34 +y= 35

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2 years ago

X+7y=24 and x-9y=-24 doing elimination

nirvana33 [79]

The easy thing to do is eliminate x by subtraction

x + 7y = 24
- x - 9y = -24
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16y = 48

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3 years 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

3 years ago