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
Usha and Parker have a combined monthly net income of $4,500. They both chip in to pay their $675 rent each month. They also hav
Shalnov [3]
Usha and Parker should not take another debt to their current situation because their debt to income ratio (DIR) has exceeded the Basic Qualified Mortgage DIR for the common benchmark. The qualified mortgage debt to income ratio is 43% and Usha and Parker debt to income ratio is 47.9%. Debt to income ratio is calculated by dividing total personal debt with net income.
5 0
3 years ago
What is the slope between the points (8, -2) and (-7, 10)​
sdas [7]

Answer:

-4/5

Step-by-step explanation:

use point slope form, which is y2-y1/x2-x1

plug in the numbers to get 10 -(-2)/-7-8. double negatives make a positive, so -2 turns into a positive. so adding them together makes 12/-15. simplify it to get -4/5.

6 0
3 years ago
How would I find the domain and range of this graph?
matrenka [14]

Answer:

Domain: [-3, 5]

Range: [-5, 4]

Step-by-step explanation:

The first thing is to define what is the domain and the range. The domain of a function f (x) is the set of all the values for which the function is defined, and the range of the function is the set of all the values that f takes.

In other words, the domain is the value on the "x" axis and the range is the value on the "y" axis.

In this case, both are an interval, the domain would be from -3 to 5 and in the case of the range it would be from -5 to 4.

Domain: [-3, 5]

Range: [-5, 4]

6 0
3 years ago
Simplify completely ((x2-4x+4)/(x2+10x+25)) x ((x+5)/(x2+3x-10)) ...?
vladimir1956 [14]
Hope I wrote this clearly

3 0
2 years ago
Filled with jelly beans. If the jar has a<br> 15% are purple How many purple beans are they ?
Rzqust [24]

Answer:

147 purple jelly beans

Step-by-step explanation:

15% of 980 is 147

8 0
2 years ago
Other questions:
  • Solve for y. 3(y-3)=6y
    7·1 answer
  • Solve using linear combinations y+x=-5 y-x=5
    6·1 answer
  • In the figure, AB¯¯¯¯¯∥CD¯¯¯¯¯ and m∠2=60°. What is m∠6?
    13·1 answer
  • The population of a certain single-cell organism doubles every hour, starting with 100 cells. Which COULD be an equation to mode
    14·1 answer
  • The slope-intercept form of a linear equation is y =mx +b, M is the slip of the line and b is where the line crosses the y-axis
    9·1 answer
  • When solving the system of equations, which expression could be substituted for r in the first equation?
    10·1 answer
  • The base of a house has area 110 m². One night 12 mm of rain falls on the roof. All of the water goes into a tank which has base
    6·1 answer
  • The function g(x) = f(x + 1) + 6. Which of the following is true about the graph of g(x).
    12·1 answer
  • How many pennies are on the nth square? 2n 2n â€"" 1 2n 1 2n â€"" 1 2n 1.
    13·1 answer
  • Find the volume of this figure. round your answer to the nearest hundredth. if necessary
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!