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
8090 [49]
3 years ago
10

An angle measures 120 degrees. Describe how to use special right triangles and the unit circle as tools to calculate the sine an

d cosine of this angle.
Mathematics
1 answer:
nalin [4]3 years ago
8 0

Answer:

120 degrees is the right angle and the 30 degree added which is 1/3 here we know as we can always divide a side measure by 90 then multiply by a second angle to find the hypotenuse. When we do this we are using a three way system just like a three way system appears when we use a right angle triangle and read the functions.

Step-by-step explanation:

You might be interested in
Can you answer this, please?
sukhopar [10]

Answer:

it is irrational,because the product of an irrational number and a non zero rational number is irrational

7 0
3 years ago
In a random sample of 1066 U.S. adults, 580 think that the U.S. government
alexandr402 [8]

Answer:

Step-by-step explanation:

This is a test of 2 population proportions. Let 1 and 2 be the subscript for the adults who think that the U.S. government is doing too little to protect the environment presently and the adults who think that the U.S. government is doing too little to protect the environment 10 years ago. The population proportions would be p1 and p2 respectively.

p1 - p2 = difference in the proportion of adults who think that the U.S. government is doing too little to protect the environment presently and the adults who think that the U.S. government is doing too little to protect the environment 10 years ago.

The null hypothesis is

H0 : p1 = p2

p1 - p2 = 0

The alternative hypothesis is

Ha : p1 ≠ p2

p1 - p2 ≠ 0

it is a two tailed test

Sample proportion = x/n

Where

x represents number of success

n represents number of samples

For the present,

x1 = 580

n1 = 1066

p1 = 580/1066 = 0.54

For 10 years ago,

x2 = 514

n2 = 1038

P2 = 514/1038 = 0.5

The pooled proportion, pc is

pc = (x1 + x2)/(n1 + n2)

pc = (580 + 514)/(1066 + 1038) = 0.52

1 - pc = 1 - 0.52 = 0.48

z = (p1 - p2)/√pc(1 - pc)(1/n1 + 1/n2)

z = (0.54 - 0.5)/√(0.52)(0.48)(1/1066 + 1/1038) = 0.04/0.02178551744

z = 1.84

Since it is a two tailed test, the curve is symmetrical. We will look at the area in both tails. Since it is showing in one tail only, we would double the area

From the normal distribution table, the area above the test z score in the right tail 1 - 0.967 = 0.033

We would double this area to include the area in the left tail of z = - 1.84 Thus

p = 0.033 × 2 = 0.066

Alpha = 0.1

Since alpha, 0.1 > p value 0.066, we would reject the null hypothesis.

Therefore, at a = 0.10, we can reject the

claim that the proportion of U.S. adults who think that the U.S. government

is doing too little to protect the environment has not changed.

4 0
3 years ago
Ms. Sculley needs to arrange 28 chairs into equal rows. She needs more than 2 chairs in each row and more than 2 rows. How many
Ilia_Sergeevich [38]

Answer: 7 rows

Step-by-step explanation:

she will have 7 rows with 4 seats in each row or 4 rows with 7 seats in each row

8 0
3 years ago
A running track has two semi-circular ends with radius 24m and two straights of length 85.9m as shown.
Semmy [17]
Answer: 5931.8m^2

Explanation:

Explanation:

85.9 x 48 + 3.14 x 24^2
= 4123.2 + 1808.64
= 5931.8m^2

6 0
2 years ago
The Jayden family eats at a restaurant that is having a 15% discount promotion. Their meal costs $78.72 before the discount, and
IrinaVladis [17]

Answer:

$82.65

Step-by-step explanation:

First, find the cost with the discount:

78.72(0.85)

= 66.91

Then, find the amount of the tip:

78.72(0.2)

= 15.74

Then, add together the cost and tip:

66.91 + 15.74

= 82.65

So, the total cost of the meal was $82.65

6 0
3 years ago
Other questions:
  • A student theater charges $9:50 per ticket. The theater has already sold 70 tickets. Write and solve an inequality that represen
    5·1 answer
  • Shelley’s pet food store sold one customer 5 peanut butter biscuits for $3. She sold another customer 7 beef treats for $4.20.
    13·2 answers
  • Determine what type of model best fits the given situation: The height of a tree increases by 2.5 feet each growing season. A. l
    14·2 answers
  • Given the inequality below:<br><br> 3x-y&gt;4<br><br> Which is the graph of the solution set?
    11·1 answer
  • Please help im really confused
    5·2 answers
  • Solve the inequality.<br> -7/8 &lt; m - 13/8
    9·1 answer
  • PLEASE HELP ASAP . PLEASE
    10·2 answers
  • <img src="https://tex.z-dn.net/?f=8%20%286%5Cfrac%7B1%7D%7B4%7D%20%2A%203.2%20-%2018%29" id="TexFormula1" title="8 (6\frac{1}{4}
    8·1 answer
  • Help! Brainliest Given &lt;3
    15·1 answer
  • "75% of 68 is what number" as an equation
    6·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!