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inysia [295]
3 years ago
15

A 12 foot ladder is placed against the side of the building. The base of the ladder is placed at an angle of 68° with the ground

for secure footing. How far is the base of the ladder from the side of the building? Round to the nearest tenth of a foot.​
Mathematics
1 answer:
3241004551 [841]3 years ago
3 0

Answer:

Step-by-step explanation:

A

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-2y+4x=14<br> solve for y:Show your work
bija089 [108]

subtract 4x from both sides

-2y=14-4x

divide each side by -2

y=2x+7

3 0
3 years ago
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Which strategy is the most appropriate strategy to solve 5x^2+30x ?
guapka [62]
B. Square root property
4 0
2 years ago
Use lagrange multipliers to find the point on the plane x â 2y + 3z = 6 that is closest to the point (0, 2, 4).
Arisa [49]
The distance between a point (x,y,z) on the given plane and the point (0, 2, 4) is

\sqrt{f(x,y,z)}=\sqrt{x^2+(y-2)^2+(z-4)^2}

but since \sqrt{f(x,y,z)} and f(x,y,z) share critical points, we can instead consider the problem of optimizing f(x,y,z) subject to x-2y+3z=6.

The Lagrangian is

L(x,y,z,\lambda)=x^2+(y-2)^2+(z-4)^2+\lambda(x-2y+3z-6)

with partial derivatives (set equal to 0)

L_x=2x+\lambda=0\implies x=-\dfrac\lambda2
L_y=2(y-2)-2\lambda=0\implies y=2+\lambda
L_z=2(z-4)+3\lambda=0\implies z=4-\dfrac{3\lambda}2
L_\lambda=x-2y+3z-6=0\implies x-2y+3z=6

Solve for \lambda:

x-2y+3z=-\dfrac\lambda2-2(2+\lambda)+3\left(4-\dfrac{3\lambda}2\right)=6
\implies2=7\lambda\implies\lambda=\dfrac27

which gives the critical point

x=-\dfrac17,y=\dfrac{16}7,z=\dfrac{25}7

We can confirm that this is a minimum by checking the Hessian matrix of f(x,y,z):

\mathbf H(x,y,z)=\begin{bmatrix}f_{xx}&f_{xy}&f_{xz}\\f_{yx}&f_{yy}&f_{yz}\\f_{zx}&f_{zy}&f_{zz}\end{bmatrix}=\begin{bmatrix}2&0&0\\0&2&0\\0&0&2\end{bmatrix}

\mathbf H is positive definite (we see its determinant and the determinants of its leading principal minors are positive), which indicates that there is a minimum at this critical point.

At this point, we get a distance from (0, 2, 4) of

\sqrt{f\left(-\dfrac17,\dfrac{16}7,\dfrac{25}7\right)}=\sqrt{\dfrac27}
8 0
2 years ago
Which mathematical property is demonstrated below? 3 + 0 = 3
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Answer:

<h3><em>IDENTITY </em><em>PROPERTY </em></h3>

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2 years ago
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mash [69]

Answer:

1/5

Step-by-step explanation:

Scale factor= Image/Object

Figure C

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