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Free_Kalibri [48]
3 years ago
13

Solve the equation 2 cos ( x ) + 1 = 0 2 cos x + 1 = 0 , 0 ≤ x ≤ 2 π 0 ≤ x ≤ 2 π . Show all of your work

Mathematics
1 answer:
TiliK225 [7]3 years ago
8 0

Answer:

2π/3, 4π/3

Step-by-step explanation:

I interpret your question as asking us to solve the equation

2cos(x) + 1 = 0

2cos(x) = -1

cos(x) = -½x  

x = arccos(-½), 0 ≤ x ≤2π

Since the cosine is negative, x must be in the second or third quadrant.

Referring to the unit circle, we find that

x = 2π/3 (120°) or x = 4π/3 (240°)

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The perimeter of a shape will always be greater then the area of the shape
bazaltina [42]
Not necessarily. For example, you can have a rectangle whose dimensions are 12 and 6. Length is 12 and 6 is the width.

The area (length × width) of the rectangle will be 72.

The perimeter of the rectangle (2l + 2w) will be 36.

So, in this case, the area was double the perimeter and the perimeter was not greater than the area of the shape.

8 0
4 years ago
What is 4.86 divided by 0.2
babymother [125]
- - Lets solve:

\frac{4.86}{0.2}

\frac{4.86}{ \frac{2}{10} }

4.86* \frac{10}{2}

- - Solve for that to get answer:

24.3

Your final answer is 24.3


7 0
4 years ago
Read 2 more answers
The screen is 9 feet tall and the string is 15 feet long. If x is the distance, in feet, along the ground from the stake to the
Bad White [126]

Answer:

c

Step-by-step explanation:

7 0
3 years ago
Which series of transformations shows that pentagon A is congruent to pentagon B?
Fantom [35]
The <u>correct answer</u> is:

B) A 90° counterclockwise rotation about the origin, followed by a reflection across the x-axis, followed by a translation 8 units right and 1 unit up.

Explanation:

The coordinates of the <u>points of the pre-image</u> are:
(3, 1)
(3, 4)
(5, 7)
(6, 5)
(6, 2)

The coordinates of the <u>points of the image</u> are:
(7,-2)
(4,-2)
(1,-4)
(3,-5)
(6,-5)

A 90° counterclockwise rotation about the origin negates the y-coordinate and switches it and the x-coordinate.  Algebraically,
(x,y)→(-y,x).

When this is applied to our points, we get:
(3, 1)→(-1, 3)
(3, 4)→(-4, 3)
(5, 7)→(-7, 5)
(6, 5)→(-5, 6)
(6, 2)→(-2, 6)

A reflection across the x-axis negates the y-coordinate.  Algebraically,
(x, y)→(x, -y).

Applying this to our new points, we have:
(-1, 3)→(-1, -3)
(-4, 3)→(-4, -3)
(-7, 5)→(-7, -5)
(-5, 6)→(-5, -6)
(-2, 6)→(-2, -6)

A translation 8 units right and 1 unit up adds 8 to the x-coordinate and 1 to the y-coordinate.  Algebraically,
(x, y)→(x+8, y+1).

Applying this to our new points, we have:
(-1, -3)→(-1+8,-3+1) = (7, -2)
(-4, -3)→(-4+8,-3+1) = (4, -2)
(-7, -5)→(-7+8,-5+1) = (1, -4)
(-5, -6)→(-5+8,-6+1) = (3, -5)
(-2, -6)→(-2+8,-6+1) = (6, -5)

These match the coordinates of the image, so this is the correct series of transformations.
3 0
4 years ago
? x 3= 192 answer the question
Zepler [3.9K]

Answer: 64

Step-by-step explanation:

i simply divided 192 by 3, because it's just the opposite of multiplying. it's a simple and easy way to get the missing number! :)

192 / 3 = 64

5 0
3 years ago
Read 2 more answers
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