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Alchen [17]
2 years ago
12

A 15ft. wire is tied to the top of a tree to provide support. If the wire forms a 25° angle with the ground, what is the height

of the tree to the nearest hundredth?
Mathematics
1 answer:
lana [24]2 years ago
4 0

Answer: 6.34\ ft

Step-by-step explanation:

Given

The length of the wire is l=15\ ft

The Wire makes an angle of 25^{\circ} with horizontal

Suppose the height of the tree is h

From the figure, we can write

\Rightarrow \sin 25^{\circ}=\dfrac{h}{l}\\\\\Rightarrow h=l\sin 25^{\circ}\\\Rightarrow h=15\sin 25^{\circ}\\\Rightarrow h=6.34\ ft

Thus, the height of the tree is 6.34\ ft

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What is the solution to the following system?
leva [86]

Answer:

(4,3,2)

Step-by-step explanation:

We can solve this via matrices, so the equations given can be written in matrix form as:

\left[\begin{array}{cccc}3&2&1&20\\1&-4&-1&-10\\2&1&2&15\end{array}\right]

Now I will shift rows to make my pivot point (top left) a 1 and so:

\left[\begin{array}{cccc}1&-4&-1&-10\\2&1&2&15\\3&2&1&20\end{array}\right]

Next I will come up with algorithms that can cancel out numbers where R1 means row 1, R2 means row 2 and R3 means row three therefore,

-2R1+R2=R2 , -3R1+R3=R3

\left[\begin{array}{cccc}1&-4&-1&-10\\0&9&4&35\\0&14&4&50\end{array}\right]

\frac{R_2}{9}=R_2


\left[\begin{array}{cccc}1&-4&-1&-10\\0&1&\frac{4}{9}&\frac{35}{9}\\0&14&4&50\end{array}\right]


4R2+R1=R1 , -14R2+R3=R3

\left[\begin{array}{cccc}1&0&\frac{7}{9}&\frac{50}{9}\\0&1&\frac{4}{9}&\frac{35}{9}\\0&0&-\frac{20}{9}&-\frac{40}{9}\end{array}\right]


-\frac{9}{20}R_3=R_3

\left[\begin{array}{cccc}1&0&\frac{7}{9}&\frac{50}{9}\\0&1&\frac{4}{9}&\frac{35}{9}\\0&0&1&2\end{array}\right]


-\frac{4}{9}R_3+R_2=R2 , -\frac{7}{9}R_3+R_1=R_1


\left[\begin{array}{cccc}1&0&0&4\\0&1&0&3\\0&0&1&2\end{array}\right]


Therefore the solution to the system of equations are (x,y,z) = (4,3,2)

Note: If answer choices are given, plug them in and see if you get what is "equal to".  Meaning plug in 4 for x, 3 for y and 2 for z in the first equation and you should get 20, second equation -10 and third 15.

7 0
3 years ago
36,000 people ride the city bus every day. On average, about how many people ride the bus each hour?
barxatty [35]
Day = 24 hours, right?
36000/24 = 1500

If I put this into words:
36000 people per 24 hours = 1500 people per 1 hour

On average, 1500 people ride the bus per hour (or each hour)
4 0
3 years ago
Read 2 more answers
3/4 divides by 1/7 =
anyanavicka [17]

3/4 divides by 1/7 =

copy dot flip

3/4 * 7/1

21/4

4 goes into 21 5 times with 1 left over

5 1/4

4 0
3 years ago
Read 2 more answers
Type the correct answer in each box
levacccp [35]

Answer:

76589607+789607p8=2

Step-by-step explanation:

3872oed0w89p23-98937ey9tg=2

4 0
3 years ago
Whats 4n = 880.4's solution??
vodka [1.7K]

Answer:

n = 220.1

Step-by-step explanation:

  • 4n = 880.4
  • n = 880.4 ÷ 4
  • n = 220.1

the value of n is 220.1

6 0
2 years ago
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