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
babymother [125]
2 years ago
5

What is the exact value of cos(11pi/21)cos(pi/7)-sin(11pi/21)sin(pi/7)?

Mathematics
2 answers:
Anika [276]2 years ago
7 0

Answer:

B

Step-by-step explanation:

-1/2

arsen [322]2 years ago
7 0

Answer:

B -1/2

Step-by-step explanation:

You might be interested in
How much will a person pay for 7.5 pounds of bananas at a price of $2.07 per pound?
igomit [66]

Answer:

$15.57

Step-by-step explanation:

2.07 times 7.50 = $15.57!

7 0
2 years ago
Help Me Please! <br> Does anyone know what is the Radical of 4/49
Serjik [45]
2/7 im pretty sure hope it helped
7 0
3 years ago
Read 2 more answers
Tammy earns 45 dollars per week working part time at a book store. She makes one dollar more for each book that she sells. The a
seraphim [82]

 Answer

77

  Step-by-step explanation:

You add how much she earns a week with 32 because she earns $1 dollar per book.

3 0
3 years ago
A can of soup has the shape of a cylinder.
Jobisdone [24]

Answer:

Step-by-step explanation:

Height h = 4.5 inches

Radius r = 3.4/2 = 1.7 inches

Area of base = πr² = 2.89π square inches

Volume of cylinder = πr²h = 2.89π4.5 = 13.0 cubic inches

6 0
2 years ago
Read 2 more answers
A quiz-show contestant is presented with two questions, question 1 and question 2, and she can choose which question to answer f
Mrrafil [7]

Answer:

The contestant should try and answer question 2 first to maximize the expected reward.

Step-by-step explanation:

Let the probability of getting question 1 right = P(A) = 0.60

Probability of not getting question 1 = P(A') = 1 - P(A) = 1 - 0.60 = 0.40

Let the probability of getting question 2 right be = P(B) = 0.80

Probability of not getting question 2 = P(B') = 1 - P(B) = 1 - 0.80 = 0.20

To obtain the better option using the expected value method.

E(X) = Σ xᵢpᵢ

where pᵢ = each probability.

xᵢ = cash reward for each probability.

There are two ways to go about this.

Approach 1

If the contestant attempts question 1 first.

The possible probabilities include

1) The contestant misses the question 1 and cannot answer question 2 = P(A') = 0.40; cash reward associated = $0

2) The contestant gets the question 1 and misses question 2 = P(A n B') = P(A) × P(B') = 0.6 × 0.2 = 0.12; cash reward associated with this probability = $200

3) The contestant gets the question 1 and gets the question 2 too = P(A n B) = P(A) × P(B) = 0.6 × 0.8 = 0.48; cash reward associated with this probability = $300

Expected reward for this approach

E(X) = (0.4×0) + (0.12×200) + (0.48×300) = $168

Approach 2

If the contestant attempts question 2 first.

The possible probabilities include

1) The contestant misses the question 2 and cannot answer question 1 = P(B') = 0.20; cash reward associated = $0

2) The contestant gets the question 2 and misses question 1 = P(A' n B) = P(A') × P(B) = 0.4 × 0.8 = 0.32; cash reward associated with this probability = $100

3) The contestant gets the question 2 and gets the question 1 too = P(A n B) = P(A) × P(B) = 0.6 × 0.8 = 0.48; cash reward associated with this probability = $300

Expected reward for this approach

E(X) = (0.2×0) + (0.32×100) + (0.48×300) = $176

Approach 2 is the better approach to follow as it has a higher expected reward.

The contestant should try and answer question 2 first to maximize the expected reward.

Hope this helps!!!

3 0
2 years ago
Other questions:
  • Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the corre
    13·1 answer
  • Jonathan rode 1.05 miles on Friday 1.5 miles on Saturday 1.25 miles on Monday and 1.1 miles on Tuesday. On which day did he ride
    7·1 answer
  • Jasmine is completing an art project she has two pieces of construction paper the first piece is 44 inches wide and the second p
    15·1 answer
  • What is the image of point (4, 3) if the rotation is 90º ? Please and thank you.
    13·1 answer
  • Use Random number generator and simulate 1000 long columns, for each of the three cases. Example: for the Car type 1, use Number
    8·1 answer
  • lex is saving money because she would like to purchase the new video gaming system that everyone has been talking about. After t
    6·1 answer
  • 3. Point A is located at (3,6). The midpoint of line segment AB is point C(11,13). What are the coordinates of point B? Use the
    15·1 answer
  • Simplify: 5x+50/x+5 • 1/x+10
    5·2 answers
  • What is 903 divided by 72?<br> 33 POINTS FOR THIS QUESTION!!
    10·1 answer
  • What are the 3 commen factors between 24 and 32
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!