1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
attashe74 [19]
3 years ago
15

Which of the following statements is true?

Mathematics
1 answer:
saveliy_v [14]3 years ago
3 0

Answer:

The answer is d.

Step-by-step explanation:

As we know, sin x= cos (90°-x)

sin 18° = cos (90°-18°)

= cos 72°.

Similarly, sin 72°= cos (90°-72°)

= cos 18°

But, sin 55°= cos (90°-55°)

= cos 35°

You might be interested in
Leslie says that 5 multiplied by an even number always results in an even product. Is Leslie's statement correct?
Rufina [12.5K]
Yes, Leslie is correct. Two such examples are 5*100, which is 500 (even) and 5*18, which is 90 (also even).
3 0
3 years ago
Read 2 more answers
Listen to internet sensation that's how im feeling atm..i really miss someone and he know's who he his :( sigh* pls come back..a
igomit [66]
Your answer would be -8.8472242e+14.


And... IF THAT SONG IS BY LIL DURK I LUV IT
3 0
3 years ago
Read 2 more answers
Simplify 4 over quantity 2 plus 7 i.
spayn [35]
To simplify 4/(2+7i), we multiply it by a fraction equal to one that removes the i value in the denominator.  The best value to do this is the complex conjugate divided by itself, so we have 4(2-7i)/((2+7i)(2-7i)).  Simplifying, we have (8-28i)/(4-(-49))=(8-28i)/53, which is a completely simplified fraction since 8 and 53 are relatively prime (or coprime), and there are no radicals in the denominator.
3 0
3 years ago
Read 2 more answers
Gravel is being dumped from a conveyor belt at a rate of 20 ft3/min, and its coarseness is such that it forms a pile in the shap
11Alexandr11 [23.1K]

Answer:

0.25 feet per minute

Step-by-step explanation:

Gravel is being dumped from a conveyor belt at a rate of 20 ft3/min. Since we are told that the shape formed is a cone, the rate of change of the volume of the cone.

\dfrac{dV}{dt}=20$ ft^3/min

\text{Volume of a cone}=\dfrac{1}{3}\pi r^2 h

Since base diameter = Height of the Cone

Radius of the Cone = h/2

Therefore,

\text{Volume of the cone}=\dfrac{\pi h}{3} (\dfrac{h}{2}) ^2 \\V=\dfrac{\pi h^3}{12}

\text{Rate of Change of the Volume}, \dfrac{dV}{dt}=\dfrac{3\pi h^2}{12}\dfrac{dh}{dt}

Therefore: \dfrac{3\pi h^2}{12}\dfrac{dh}{dt}=20

We want to determine how fast is the height of the pile is increasing when the pile is 10 feet high.

h=10$ feet$\\\\\dfrac{3\pi *10^2}{12}\dfrac{dh}{dt}=20\\25\pi \dfrac{dh}{dt}=20\\ \dfrac{dh}{dt}= \dfrac{20}{25\pi}\\ \dfrac{dh}{dt}=0.25$ feet per minute (to two decimal places.)

When the pile is 10 feet high, the height of the pile is increasing at a rate of 0.25 feet per minute

5 0
3 years ago
You are designing a staircase to reach a second floor that is 113" above the ground floor of a building. The owner of the buildi
gtnhenbr [62]

Answer:

Step-by-step explanation:

total height, H = 113 inches

height of each stair case, h = 7.25 inches

Number of stair case, n = total height / height of each stair case

n = 113 / 7.25 = 15.6

7 0
4 years ago
Other questions:
  • (Had to re-upload - Chose the wrong picture and couldn't edit.
    7·1 answer
  • 1. How many complex roots does the polynomial equation have?
    5·2 answers
  • 24 and 48 are common multiples of 4 and B. if B is a one digit number greater than 1, what is B?​
    12·1 answer
  • In circle C major arc ABD is represented by 4x+50. what is the value of x in the diagram
    7·1 answer
  • Marni has 11 ounces of walnuts. She needs 6 ounces for one recipe and \frac {1}{4} 4 1 ​ pound for another. There are 16 ounces
    5·2 answers
  • Bob has 5 apples now he has 5 how much does he have now​
    7·2 answers
  • Solve the equation 3 - (2c– 8) = 7
    10·1 answer
  • Solve the inequality 31< 3x+4
    11·1 answer
  • 5m-3m+7n+2-5n <br><br>please help​
    8·2 answers
  • Back again lol (brainliest) plsss help
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!