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2 years ago

13. In the right triangle depicted below, what is the cosine of angle B?

Mathematics

1 answer:

Anastasy [175]2 years ago

8 0

Answer:

number c

Step-by-step explanation:

.............. just for filling 20 characters

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Angel has an action figure collection of 300 action figures. He keeps 267 of the action figures on his wall. What percentage of

Veseljchak [2.6K]

Answer:

89% of Angel's action figure collection keeps on his wall.

Step-by-step explanation:

Percentages

To calculate the X% of a quantity Y, we must multiply both numbers and divide by 100:

X% of Y = X * Y / 100

For example, 15% of 780 = 15 * 780 / 100 = 117

If we want to know what percentage is m with respect to n, we proceed as follows:

percentage = m / n * 100%

Anges has a 300 action figures collection, 267 of which are kept on his wall. Here m=267, n=300, thus:

percentage = 267 / 300 * 100% = 89%

89% of Angel's action figure collection keeps on his wall.

5 0

3 years ago

Out of the 2000 students at Smith Middle School, 250 have green eyes, which is 12.5%. Mrs. Craig surveys her math class and 8 ou

vivado [14]

B)
The sample that Mrs. Craig took was too small.

I'm assuming the question is asking why they were not the same percentage?

6 0

3 years ago

Read 2 more answers

Find the missing fraction. ___ + 1/16 = 3/2 No links!

DochEvi [55]

Answer:

23/16

Step-by-step explanation:

3*8/2*8=24/16-1/16=23/16

7 0

3 years ago

In the circle below, suppose m STQ = 102° and mZTSR=56º. Find the following.

katrin [286]

Answer:

Step-by-step explanation:

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2 years ago

to estimate the height of the jin mao tower in shanghai , a tourist sights the top of the tower form a mirror that is 86.7 meter

Ray Of Light [21]

Answer:

The height of the tower = 420.48 meters

Step-by-step explanation:

For better understanding of the solution, see the figure attached below :

Let the height of the tower be x meters

Now, using the laws of reflection : angle of reflection = angle of incidence

Also, both the tower and the tourist are standing parallel to each other

⇒ ∠A = ∠i ( Alternate interior angles are equal)

Similarly, ∠D = ∠r ( Alternate interior angles)

But, ∠i = ∠r

⇒ ∠A = ∠D

Also, the tourist and the tower is perpendicular to the ground surface.

⇒ m∠B = m∠E = 90°

Now, in ΔABC and ΔDEC

∠A = ∠D (Proved above)

m∠B = m∠E = 90°

So, by AA postulate of similarity of triangles, ΔABC ~ ΔDEC

As the sides of similar triangles are proportional to each other

$\frac{AB}{DE}=\frac{BC}{EC}\\\\\implies\frac{1.92}{x}=\frac{0.4}{87.6}\\\\\implies x=\frac{87.6\times 1.92}{0.4}\\\\\bf\implies x = 420.48\textbf{ meters}$

Hence, The height of the tower = 420.48 meters

5 0

3 years ago