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nika2105 [10]
3 years ago
3

Which expression is equivalent to cos120°?

Mathematics
2 answers:
umka21 [38]3 years ago
5 0
Cos 120 degrees has a reference angle of 60 degrees and it is located in Quadrant II.
Since the reference angle is 60 degrees it will have the same cos as 60 degrees in Q I. Cos 60 = 1/2
In Q II cos is negative so Cos 120 = -1/2
xeze [42]3 years ago
3 0
-1/2,3/2 or 2pie/3 because thats how it is on the unit circle
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Juli2301 [7.4K]

Answer:

(10/3, 2/3)

Step-by-step explanation:

You may find it easier to write these two equations x+y=4 2x-y=6 in a column:

x+y=4

2x-y=6

Adding these together will eliminate y:

3x = 10.  Then x = 10/3.

Substituting 10/3 for x in the first equation results in:

10/3 + y = 4

Clear fractions by multiplying all three terms by 3:

10 + 3y = 12

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The solution is (10/3, 2/3)

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B. 12 boys

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katrin [286]

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3 years ago
Find the least common multiple of 3x and 3(x-2).
larisa [96]

Answer:

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Step-by-step explanation:

7 0
3 years ago
The population of a town is increasing at a rate of 6.2% per year. The city council believes they will have to add another eleme
kow [346]

Answer:

The correct solution is "4.6".

Step-by-step explanation:

Given:

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r = 6.2%

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A = 100000

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P = 76000

As we know,

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On substituting the values, we get

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On taking log both sides, we get

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⇒                   n=\frac{ln(\frac{100}{76} )}{ln(1.062)}

By putting the values of log, we get

⇒                      =4.5622

or,

⇒                      =4.6

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3 years ago
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