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3 years ago

What is the exact value of cos 2π/3.

2 answers:

4 0

The problem ask to calculate the exact value of the expression or trigonometric expression that is stated in you problem. Base on following some theories and rules about solving trigonometric expressions, the value of cos 2pi over 3 would be -1/2. I hope you are satisfied with my answer and feel free to ask for more

nignag [31]3 years ago

3 0

Cos 2(phi)/3= cos 120°= -cos 60°= -1/2

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(free upvote) write an algebraic expression for the following phrase:

sashaice [31]

4 - (x + 6)
or -x -2
.......

3 0

4 years ago

5-8|-2x|=-80<br><br> Blank 1: ?<br> Blank 2: ?

denpristay [2]

Answer:

$x=\frac{85}{16}, x=-\frac{85}{16}$

Step-by-step explanation:

Hi there!

We are given the absolute value equation:

5-8|-2x|=-80

We want to solve it for x

First, let's make sure that ONLY the absolute value equation is on the left side

So subtract 5 from both sides

-8|-2x|=-85

Now divide both sides by -8

|-2x|=85/8

Now, for an absolute value equation, we can split it up into two parts, as |x| can be equal to both x and -x

In this case, |-2x| can equal to 85/8, but it can also equal -85/8

That's why for absolute value, there are always 2 cases

For the first case, if |-2x| is equal to 85/8:

Note: we open up the absolute value when we are solving a case, as it is one of the possiblities that can happen for the equation. So it would be true.

-2x=85/8

Divide both sides by -2

x=-85/16

In the second case, if -2x is equal to -85/8:

-2x=-85/8

Divide both sides by -2

x=85/16

So the answers are $x=\frac{85}{16}, x=-\frac{85}{16}$

Hope this helps!

4 0

3 years ago

The weight (in pounds) w=f(d) of an object varies inversely as the square of its distance (in thousands of miles) d from the cen

yuradex [85]

The joint variation that is given in the problem above can be expressed as follows:
w = k/d²
where w is the weight, k is the variation constant, and d is the distance from the center of the earth. Substituting the first scenario to obtain the value of k,
160 = k/(4000)²
k = 2.56 x 10^9
Using this value for the second scenario,
w = (2.56 x 10^9) / (8,000)² = 40 lbs
Thus, the weight of the man, 8000 miles above the center of the earth is 40 lbs.

5 0

4 years ago

What is the simplest form of 0.0115

Roman55 [17]

23/200

Hope this helps! :)

8 0

3 years ago

Read 2 more answers

What are the coordinates of the points indicated on the graph?

diamong [38]

Answer: