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
Alborosie
3 years ago
11

If sin x = .42, what is cos x?

Mathematics
1 answer:
horrorfan [7]3 years ago
3 0
We\ know:\\\\\sin^2x+\cos^2x=1\to\cos^2x=1-\sin^2x\to\cos x=\sqrt{1-\sin^2x}\\\\\sin x=0.42\\subtitute\\\\\cos x=\sqrt{1-0.42^2}=\sqrt{1-0.1764}=\sqrt{0.8236}\approx0.91
You might be interested in
I need help with my math
kherson [118]

Answer:

Ok what is the problem

Step-by-step explanation:

8 0
3 years ago
-3x+4=-17<br>show how you did it
Oxana [17]
-3x+4=-17
subtract -4 from both sides
divide -3 from both sides
the answer is 7
8 0
3 years ago
If 8 identical blackboards are to be divided among 4 schools,how many divisions are possible? How many, if each school mustrecei
MAXImum [283]

Answer:

There are 165 ways to distribute the blackboards between the schools. If at least 1 blackboard goes to each school, then we only have 35 ways.

Step-by-step explanation:

Essentially, this is a problem of balls and sticks. The 8 identical blackboards can be represented as 8 balls, and you assign them to each school by using 3 sticks. Basically each school receives an amount of blackboards equivalent to the amount of balls between 2 sticks: The first school gets all the balls before the first stick, the second school gets all the balls between stick 1 and stick 2, the third school gets the balls between sticks 2 and 3 and the last school gets all remaining balls.

 The problem reduces to take 11 consecutive spots which we will use to localize the balls and the sticks and select 3 places to put the sticks. The amount of ways to do this is {11 \choose 3} = 165 . As a result, we have 165 ways to distribute the blackboards.

If each school needs at least 1 blackboard you can give 1 blackbooard to each of them first and distribute the remaining 4 the same way we did before. This time there will be 4 balls and 3 sticks, so we have to put 3 sticks in 7 spaces (if a school takes what it is between 2 sticks that doesnt have balls between, then that school only gets the first blackboard we assigned to it previously). The amount of ways to localize the sticks is {7 \choose 3} = 35. Thus, there are only 35 ways to distribute the blackboards in this case.

4 0
3 years ago
Right Triangles and Trigonometry Homework 5
gavmur [86]

this picture has bad quality, please resend with better picture so i can answer all of them

4 0
2 years ago
Is it C or no? Can u help please
Westkost [7]
 the answer is Probably C.

7 0
3 years ago
Other questions:
  • Which expression can be simplified as
    10·1 answer
  • What is the 3rd quadrant of 10,20,30,40,50,60​
    5·2 answers
  • Julio has $127 in his bank account. He gets $30 for his birthday. He also has a part-time job that pays $9 per hour. How many ho
    5·2 answers
  • Show all work to factor x4 − 17x2 + 16 completely.
    13·1 answer
  • Which of the following is a solution to this inequality?
    13·2 answers
  • What is the reciprocal of 4/12?​
    7·2 answers
  • Someone PLEASE HELP ME<br><br>Find the slope of the line <br><br>Algebra 1
    5·2 answers
  • What is -5/9 = -10/3 v
    5·1 answer
  • Solve for r in the expression 3 (2 - 5) = 12.​
    7·2 answers
  • In the figure below lines m and n are parallel. in the diagram shown, Angle 7 measures 92 degrees. What is the measure of Angle
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!