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Dmitrij [34]
3 years ago
8

90 people attended the movies yesterday. 87 people attended the movies today. Is this an increase or decrease? What was the perc

ent change?
Mathematics
1 answer:
Anna71 [15]3 years ago
7 0

Answer:

This is a decrease

Step-by-step explanation:

3.33%

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The angle of elevation from me to the top of a hill is 51 degrees. The angle of elevation from me to the top of a tree is 57 deg
julia-pushkina [17]

Answer:

Approximately 101\; \rm ft (assuming that the height of the base of the hill is the same as that of the observer.)

Step-by-step explanation:

Refer to the diagram attached.

  • Let \rm O denote the observer.
  • Let \rm A denote the top of the tree.
  • Let \rm R denote the base of the tree.
  • Let \rm B denote the point where line \rm AR (a vertical line) and the horizontal line going through \rm O meets. \angle \rm B\hat{A}R = 90^\circ.

Angles:

  • Angle of elevation of the base of the tree as it appears to the observer: \angle \rm B\hat{O}R = 51^\circ.
  • Angle of elevation of the top of the tree as it appears to the observer: \angle \rm B\hat{O}A = 57^\circ.

Let the length of segment \rm BR (vertical distance between the base of the tree and the base of the hill) be x\; \rm ft.

The question is asking for the length of segment \rm AB. Notice that the length of this segment is \mathrm{AB} = (x + 20)\; \rm ft.

The length of segment \rm OB could be represented in two ways:

  • In right triangle \rm \triangle OBR as the side adjacent to \angle \rm B\hat{O}R = 51^\circ.
  • In right triangle \rm \triangle OBA as the side adjacent to \angle \rm B\hat{O}A = 57^\circ.

For example, in right triangle \rm \triangle OBR, the length of the side opposite to \angle \rm B\hat{O}R = 51^\circ is segment \rm BR. The length of that segment is x\; \rm ft.

\begin{aligned}\tan{\left(\angle\mathrm{B\hat{O}R}\right)} = \frac{\,\rm {BR}\,}{\,\rm {OB}\,} \; \genfrac{}{}{0em}{}{\leftarrow \text{opposite}}{\leftarrow \text{adjacent}}\end{aligned}.

Rearrange to find an expression for the length of \rm OB (in \rm ft) in terms of x:

\begin{aligned}\mathrm{OB} &= \frac{\mathrm{BR}}{\tan{\left(\angle\mathrm{B\hat{O}R}\right)}} \\ &= \frac{x}{\tan\left(51^\circ\right)}\approx 0.810\, x\end{aligned}.

Similarly, in right triangle \rm \triangle OBA:

\begin{aligned}\mathrm{OB} &= \frac{\mathrm{AB}}{\tan{\left(\angle\mathrm{B\hat{O}A}\right)}} \\ &= \frac{x + 20}{\tan\left(57^\circ\right)}\approx 0.649\, (x + 20)\end{aligned}.

Equate the right-hand side of these two equations:

0.810\, x \approx 0.649\, (x + 20).

Solve for x:

x \approx 81\; \rm ft.

Hence, the height of the top of this tree relative to the base of the hill would be (x + 20)\; {\rm ft}\approx 101\; \rm ft.

6 0
3 years ago
There are 50 pennies in a roll how many pennies are in a 6rolls
Viktor [21]
300 pennies multiply 6×50=300
7 0
3 years ago
If x is equal to 50 and y is equal to 8<br><br><br> then what is the value of x - 7y?
sesenic [268]

Answer.

5x+7y=50

Step-by-step explanation:

7y=5x-50

y=(5x-50)/7

4 0
3 years ago
Read 2 more answers
Solve the equation or formula for the indicated variable a= 5r2t for t
Alexeev081 [22]

Answer:

a/ (5r^2) = t

Step-by-step explanation:

a= 5r^2 t

Divide each side by 5r^2

a/ 5r^2 = 5r^2 t/5r^2 t

a/ 5r^2 = t


4 0
3 years ago
Read 2 more answers
What's the answer to this problem
topjm [15]

Answer: 5' 10"


Explanation: Borrow a foot from 8 to make it 7 feet and 16 inches. Subtract 6 from 16 to get 10 inches. Subtract 2 from 7 to get 5 feet. So the answer is 5' 10".


6 0
3 years ago
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