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
kaheart [24]
3 years ago
9

The angle θ lies in Quadrant II. sinθ=3/4 What is cosθ ?

Mathematics
1 answer:
Elden [556K]3 years ago
4 0

Hello from MrBillDoesMath

Answer:

[email protected] = - sqrt(7)/ 4    

which is choice B

Discussion:

This problem can be solved by drawing triangles and looking at ratios of sides or by using the trig identity:

([email protected])^2 + (sin2)^2 = 1

If [email protected] = 3/4 , the

([email protected])^2 + (3/4)^2 = 1 =>              (subtract (3/4)^2 from both sides)

([email protected])^2 = 1 - (3/4)^2  = 1 - 9/16   = 7/16

So...... taking the square root of both sides gives

[email protected] =  +\- sqrt(7)/ sqrt(16) = +\- sqrt(7)/4

But is [email protected] positive or negative?  We are told that @ is in the second quadrant and cos(@) is negative in this quadrant, so our answer must be negative

[email protected] = - sqrt(7)/ 4    

which is choice B


Thank you,

Mr. B


You might be interested in
A salesperson is guaranteed $450 per week plus a 4% commission on all sales.
solong [7]
p\%=\dfrac{p}{100}\\\\4\%=\dfrac{4}{100}=0.04\\\\4\%\ of\ s\ dollars\ of\ sales\to0.04s\\\\An\ equation:\\\\\boxed{P=0.04s+450}
5 0
3 years ago
Explain in words how you would evaluate the expression 5.1 + q ÷ 3.4 for q = 28.9
statuscvo [17]
You would plug in twenty eight point nine to the q. So it would be five point one plus twenty eight point nine divided by three point four, which equals thirteen point six.
4 0
3 years ago
Read 2 more answers
Find the equation of the straight line with the gradient -2/3 and passing through the point(1,1)
adell [148]

Answer:

y = -2/3 x + 5/3

Step-by-step explanation:

y = mx + b

y = -2/3 x + b

1 = -2/3 × 1 + b

3/3 + 2/3 = b

b = 5/3

y = -2/3 x + 5/3

4 0
2 years ago
A color printer prints 34 pages in 12 minutes. How many pages does it print per minutes?
RSB [31]

Answer:

almost 3 per minute but not just about there yet

Step-by-step explanation:

34/12 = 2.8333333333~

6 0
3 years ago
Read 2 more answers
ANSWER THE 2 QUESTION IN 1 MINUTE AND YOU WILL BE THE BRAINLIEST! QUICK QUICK PLEASE!
Oksi-84 [34.3K]

Answer:

1. 54

2. 5

Step-by-step explanation:

1. 18 x 3 = 54

2. 90/18 = 5

4 0
3 years ago
Read 2 more answers
Other questions:
  • Christopher went into a restaurant and bought 5 hamburgers and 10 drinks, costing a total of $52.50. Wyatt went into the same re
    13·1 answer
  • Maria bought three t-shirts at her favorite store t shirt paradise. she had a 25% of coupon and paid $45 in total.what was the o
    8·2 answers
  • How do you factor 450 a2 +242c2 + 660ac​
    10·1 answer
  • Which functions are symmetric with respect to the y-axis? Check all that apply.
    10·2 answers
  • The surface area of a rectangular prism is 220 cm2. Two of the dimensions are 5 cm. Find the measure of the other dimension.
    6·1 answer
  • 2 friends equally share 5 cookies. How many cookies<br>does each friend get?​
    9·2 answers
  • How do you do this I’m in 9th grade
    6·1 answer
  • Help please asp. !!!
    13·1 answer
  • The Mohs scale is used to measure:<br><br> streak<br> cleavage<br> hardness<br> luster
    7·2 answers
  • ΔTUV∼ΔMLV
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!