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timama [110]
3 years ago
9

I need help!!!!!! I dont know what else to put in here

Mathematics
1 answer:
skad [1K]3 years ago
5 0

The answer is D. Quadrant I, as both the X and Y coordinates are positive.

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Solve 4 cos2x-3 = 0 for all real values of x.
vichka [17]

4 cos² x - 3 = 0

4 cos² x = 3

cos² x = 3/4

cos x = ±(√3)/2

Fixing the squared cosine doesn't discriminate among quadrants.  There's one in every quadrant

cos x = ± cos(π/6)

Let's do plus first.  In general, cos x = cos a has solutions x = ±a + 2πk integer k

cos x = cos(π/6)

x = ±π/6 + 2πk

Minus next.

cos x = -cos(π/6)

cos x = cos(π - π/6)

cos x = cos(5π/6)

x = ±5π/6 + 2πk

We'll write all our solutions as

x = { -5π/6, -π/6, π/6, 5π/6 } + 2πk integer k

3 0
3 years ago
PLEASE HELP!! It's due tomorrow.
Delicious77 [7]

Answer:

Step-by-step explanation:

A. Directrix: y = 4-6 = -2

:::::

B. Axis of symmetry: x = 6

Axis of symmetry intersects directrix at (6,-2)

:::::

C . Vertex is halfway between focus and directrix, at (6,1)

:::::

D. The focus lies above the directrix, so the parabola opens upwards.

:::::

E. Focal length p = 1/(4×0.5)

:::::

F. p = 0.5

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G. y = 0.5(x-6)² + 1

7 0
2 years ago
PLEASE HELP!<br> ON A TEST!<br> (Show work)
Fiesta28 [93]

Answer:

Um what is the question on the test?

6 0
2 years ago
Find the slope of a line parallel to each given line -2/5x + 3
masha68 [24]

9514 1404 393

Answer:

  -2/5

Step-by-step explanation:

The slopes of parallel lines are the same. The slope of the given line is -2/5, the coefficient of x.

The slope of a parallel line is -2/5.

3 0
2 years ago
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Approximate the distance between (1,2) and (7, 6) to the nearest tenth.
viva [34]

Check image below for answer!

4 0
2 years ago
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