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tekilochka [14]
3 years ago
10

For which angle theta is cos theta =-1?a) 270b) 360c) 450d) 540​

Mathematics
2 answers:
yanalaym [24]3 years ago
7 0

Answer:

540°.

Step-by-step explanation:

On a unit circle, cos θ = -1 at 180°.

However, cos θ has a period of 2π, or 360°. This means that cos θ will equal to -1 again after 2π.

To solve for the angle:

180° + 360° = 540°. This is the next angle at which cos θ = -1.

Elena-2011 [213]3 years ago
6 0
Your answer would be D 540
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2x - 5y = 6
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a recipe calls for a total of 3 2/3 cups of flour and sugar. it the recipe calls for 1/4 cup of sugar, how much flour is needed?
zavuch27 [327]

Answer:

This is very detailed as I wish to make some principles about fractions clear.

3

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Explanation:

This question boils down to  

3

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A fractions structure is that of:

count

size indicator of what you are counting

→

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You can not directly add or subtract the counts (numerators) unless the size indicators (denominators) are the same.

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Consider  

3

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Write as  

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Multiply by 1 and you do not change the value. However, 1 comes in many forms so you can change the way something looks without changing its true value

[

3

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1

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2

3

[

3

×

3

3

]

+

2

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9

3

   

+

2

3

 

=

 

11

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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Putting it all together

3

2

3

−

1

4

 

→

 

11

3

−

1

4

But the size indicators are not the same. I chose to make them become 12

11

3

−

1

4

 

→

 

[

11

3

×

1

]

−

[

1

4

×

1

]

               

→

 

[

11

3

×

4

4

]

−

[

1

4

×

3

3

]

               

→

     

44

12

     

−

 

3

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Now we may subtract the counts

               

→

 

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=

 

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But this is the same as  

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=

 

1

2

+

2

1

2

+

2

1

2

+

5

12

 

=

 

3

5

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Step-by-step explanation:


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