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pogonyaev
3 years ago
5

If tan x = , and 0 < x < , what is cos(x – 3x)?

Mathematics
1 answer:
sweet-ann [11.9K]3 years ago
6 0

Answer:cos  ( − 2 x )

Step-by-step explanation: Subtract  3 x  from  x .

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Solve for:<br><br><img src="https://tex.z-dn.net/?f=x%5E%7B2%7D%20%20%2B%205x%20%3D%201" id="TexFormula1" title="x^{2} + 5x = 1
mixer [17]

x^2+5x-1=0\\x^2+5x+(\frac{5}{2})^2-(\frac{5}{2})^2-1=0\\(x+\frac{5}{2})^2-\frac{25}{4}-\frac{4}{4}=0\\(x+\frac{5}{2})^2-\frac{29}{4}=0\\(x+\frac{5}{2})^2=\frac{29}{4}\\x+\frac{5}{2}=\sqrt{\frac{29}{4}} , x+\frac{5}{2}=-\sqrt{\frac{29}{4}}\\x=\frac{\sqrt{29} }{2} - \frac{5}{2} , x=-\frac{\sqrt{29} }{2} - \frac{5}{2} \\x=\frac{\sqrt{29}-5 }{2} , x=-\frac{\sqrt{29} -5}{2}

4 0
3 years ago
Write the equation 9y = 12x + 0.2 in standard form. Identify A, B, and C.
uysha [10]

Answer:

A = -12, B = 9 and C = .2

Step-by-step explanation:

So it just looks like we need to use algebra to move everything around to get it in the form Ax + By = C

So, let's start with 9y = 12x + 0.2.  From standard form we have all terms wth variables on one side, so let's do that.  the right sie has both a variable term and non variable term, so let's get rid of the variable term.  The variable term is 12x, so to get rid of it you subtract 12x from both sides.

9y = 12x + 0.2

9y - 12x = 0.2

To make it exactly in standard form just rarrnge.

-12x + 9y = 0.2

So now we have A = -12, B = 9 and C = .2

5 0
3 years ago
PLEASE PLEASE PLEASE PLEASE PLEASE HELP! ANSWER WORTH 20 POINTS! I need answers ASAP!
timurjin [86]

Answer:

8.66

Step-by-step explanation:

root 75 is also 5 root 3 (after simplifying)

when that is converted into a decimal we get

8.660254038...

Rounding to the nearest hundred of that number we focus on these two numbers

8.6<u><em>60</em></u>254038...

As a result to the nearest hundreth is 8.66

3 0
3 years ago
The Sweet Treat sells 40 lbs of gummy bears and 30 caramel apples every day. At this rate, how many lbs of gummy bears will be s
Sliva [168]

Answer:

8 pounds of gummy bears.

Step-by-step explanation:

To find this answer I did:

40/30 = 4/3

Then,

4/3 x 6 = 24/3

This simplified is 8.

To check:

8/6 x 5 = 40/30

3 0
3 years ago
How to write an equivalent expression for n times a using only addition
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How to write an equivalent expression for n time a using o
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4 years ago
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