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
katovenus [111]
3 years ago
5

Find cos 2α; the angle α is in the fourth quadrant, and sin α = -0.45. Which double-angle identity should you use?

Mathematics
1 answer:
mihalych1998 [28]3 years ago
4 0

Answer:

it is the last one

Step-by-step explanation:

me big brain

You might be interested in
How do you divide <br> 2 / 7367
Helen [10]

Answer:

0.00027148092

Step-by-step explanation:

calculator lol

4 0
3 years ago
Read 2 more answers
I need some help on this math problem, thanks so much
bekas [8.4K]

Answer:

The answer is C.

Step-by-step explanation:

Hit 'em with the Law of Sines.

sin(A)/a = sin(B)/b.

Let's say x is equal to "A", thus 5 is "a".

sin(x)/5 = sin(B)/b.

We could go for the obvious choice for "B", which would be the 90 degrees shown. To solve for the hypotenuse which will be "b", let's use the Pythagorean Theorem:

a^2 + b^2 = c^2

5^2 + 20^2 = c^2

25 + 400 = 425

sqrt(425) = about 20.6, which we can now substitute "b" with.

sin(x)/5 = sin(90)/20.6

sin(x)/5 = 1/20.6

sin(x)/5 = 0.04854...

sin(x) = 0.2427...

You can plug in sin^-1(0.2427) into your calculator, and you should end up with something like 14.047... which equates to answer choice C.

6 0
3 years ago
Your family goes to a Southern-style restaurant for dinner. There are 7 people in your family. Some order the chicken dinner for
butalik [34]

Answer:

a) 4 people ordered streak dinner

b) 3 people ordered chicken dinner

Step-by-step explanation:

Let the number of people that ordered steak dinner be x

and the number of people that ordered chicken dinner be y

From the question,

There are 7 people in your family

Hence, we can write that

x + y = 7 ...... (1)

Also from the question

Some order the chicken dinner for $13 and some order the steak dinner for $18 and the total bill was $111.

We can then write that

13y + 18x = 111 ...... (2)

From equation (1)

x + y = 7

Then,

x = 7 - y ...... (3)

Put this into equation (2)

13y + 18x = 111

13y + 18(7 - y) = 111

13y + 126 - 18y = 111

-5y = -15

5y = 15

y = 15 / 5

y = 3

Put the value of y into equation (3) to get x

x = 7 - y

Then

x = 7 - 3

x = 4

Hence, 4 people ordered streak dinner

and 3 people ordered chicken dinner

a) 4 people ordered streak dinner

b) 3 people ordered chicken dinner

3 0
2 years ago
What value of x makes this equation true?
m_a_m_a [10]
2(2)-3=5-2(2)
4-3=5-4
1=1

The correct answer is A
5 0
3 years ago
Read 2 more answers
In parallelogram JKLM, m&lt;L exceeds m&lt;M by 30 degrees. What is the measure of M&lt;J?
Damm [24]

 

Answer:

2)105°

Step-by-step explanation:

In this parallelogram, J should be congruent to L (J=L). We can solve this problem if we find out the value of L.

The sum of the adjacent angle of the parallelogram will be equal to 180 degrees, so  the equation is

L + M = 180

M=180- L

If L exceeds M by 30 degrees then the equation will be

L=M +30  

If you combine both equations, it will be

L+30 = M +30

L+30 = (180- L) +30

L + L= 180 + 30

2L= 210

L=105

3 0
3 years ago
Other questions:
  • Being financially prepared for retirement requires planning.<br><br> true<br> false
    12·2 answers
  • A test has 100 questions. Cora got 85 questions correct. What decimal shows the part of the test she answered correctly? What de
    11·2 answers
  • When a data set is normally distributed, about how much of the data fall within one standard deviation of the mean?
    10·1 answer
  • What does -9-7(1-4v) equal???
    6·1 answer
  • 1. number 5 added to three times the product of M and N.
    11·1 answer
  • The cost of a shirt was originally $ 40 but the price dropped to $32 because it was on sale. What was the percent change in the
    14·2 answers
  • WILL GIVE BRAINLYIST DUE IN 2 HOURS
    15·1 answer
  • Write an equivalent expression for x^4 over 4<br><br> help <br> please
    14·1 answer
  • I need help in solving a math problem.
    5·1 answer
  • Maya invests $3,000 into a brokerage account
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!