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Crank
3 years ago
9

Trigonometry word problems

Mathematics
1 answer:
astraxan [27]3 years ago
7 0

From a point on the ground 47 feet from the foot of a tree, the angle of elevation of the top of the tree is 35º. Find the height of the tree to the nearest foot.
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a box with a square base and open top must have a volume of 70304 c m 3 cm3 . we wish to find the dimensions of the box that min
Dmitriy789 [7]

The box should have base 52 cm by 52 cm and height 26 cm.

What is volume?

A three-dimensional space's occupied volume is measured. It is frequently expressed as a numerical value using SI-derived units, other imperial units, or US customary units. Volume definition and length definition are connected.

The Volume of a box with a square base x by x cm and height h cm is

V = x^2h

Since the surface area directly affects the amount of material used, we can reduce the amount of material by reducing the surface area.

The surface area of the box described is  A = x^2 + 4xh

We need A as a function of x alone, so we'll use the fact that

V = x^2h= 70304 cm^3

⇒ h = \frac{70304}{x^2}

So, the area becomes,

A = x^2+4x(\frac{70304}{x^2})\\ A = x^2 + \frac{281216}{x}

We want to minimize A, so

A' = 2x - \frac{281216}{x^2} =0\\\frac{2x^3-281216}{x^2}=0\\ {2x^3-281216} = 0\\x^3 - 140608=0\\x^3 = 140608\\x = 52

The second derivative test verifies that A has a minimum at this critical number:

A'' = 2+\frac{562432}{x^3}  which is positive at x = 52.

Now,

h = \frac{70304}{x^2}= \frac{70304}{(52)^2}=26

Hence, The box should have base 52 cm by 52 cm and height 26 cm.

To know more about volume, click on the link

brainly.com/question/463363

#SPJ4

8 0
1 year ago
State the type of angles and solve for the yven vatizble.
Alika [10]

Answer:

1st option

Step-by-step explanation:

The 2 angles are alternate exterior angles and are congruent , so

3x = 2x + 20 ( subtract 2x from both sides )

x = 20

4 0
3 years ago
What is the value of x in the equation 4x + 8y = 40, when y = 0.8?<br><br> 4.6<br> 8.4<br> 10<br> 12
Mnenie [13.5K]
<span> <span><span> y           x
</span> <span> 0.8      8.4
</span> <span> 4.6      0.8
</span> <span> 8.4     -6.8
</span> <span> 10     -10
</span> 12     -14</span></span>
8 0
3 years ago
Read 2 more answers
Need help with this geometry problem.
snow_tiger [21]

Answer:

D

Step-by-step explanation:

The correct answer choice is D.  Note how BC and MN appear to have nearly the same lengths, whereas none of the other statements are true.  Note, also, that this diagram is not to scale; you could make the problem easier by redrawing MNOP so that it has the same orientation as does ABCD and the same corresponding side lengths.

8 0
3 years ago
Read 2 more answers
Una antena de televisión será sujeta con un cable de 6 m de longitud de la parte superior de la misma, a una argolla que se encu
mylen [45]

Answer:

5.196 m

Step-by-step explanation:

p = La perpendicular del triángulo es la longitud de la antena.

h = La hipotenusa del triángulo es la longitud del cable conectado a la parte superior del poste = 6 m

\theta = Incline el cable con el suelo = 60^{\circ}

De las funciones trigonométricas sabemos que

\sin\theta=\dfrac{p}{h}\\\Rightarrow p=h\sin\theta\\\Rightarrow p=6\times \sin60^{\circ}\\\Rightarrow p=6\times\dfrac{\sqrt{3}}{2}\\\Rightarrow p=3\sqrt{3}\\\Rightarrow p=3\times 1.732=5.196\ \text{m}

La longitud de la antena es 5.196 m.

8 0
3 years ago
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