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Artemon [7]
3 years ago
9

Please help!! 15 points!!

Mathematics
2 answers:
Shkiper50 [21]3 years ago
6 0

Here's the solution in attachment :

vampirchik [111]3 years ago
3 0

- 1 =  - 3 - 4 \cos(4θ +  \frac{2\pi}{3} )  \\  - 1 + 4 \cos(4θ +  \frac{2\pi}{3} )  =  - 3 \\ 4 \cos(4θ +  \frac{2\pi}{3} )  =  - 3 + 1 \\ 4 \cos(4θ  + \frac{2\pi}{3} )  =  - 2 \\  \cos(4θ  + \frac{2\pi}{3} )  =  -  \frac{1}{2}  \\  \cos(4θ +  \frac{2\pi}{3} )  =  -  \frac{1}{2}  \\  \cos(2\pi - (4θ +  \frac{2\pi}{3} ))  =  -  \frac{1}{2}  \\ 4θ +  \frac{2\pi}{3}  = arccos( -  \frac{1}{2} ) \\  \cos( \frac{4\pi}{3}  - 4θ)  =  -  \frac{1}{2}

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Answer:

95 degrees

Step-by-step explanation:

The sum of the measures of a quadrilateral is 360 degrees.  360-105-80-80 = 95 degrees

4 0
2 years ago
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matrenka [14]

Answer:

1) The system of equations is 5x+4y=75 and x+y=18

2) The first number is 3 and the second number is 15

Step-by-step explanation:

1) Let be "x" the first number and "y" the second number.

Remember that:

a- The word "times" indicates multiplication.

b- A sum is the result of an addition.

c- "Is" indicates this sign:  =

Then, the sum of 5 times "x" and 4 times "y" is 75, can written as:

5x+4y=75

And "The sum of the two numbers is 18" can written as:

x+y=18

Therefore, the System of equations is:

\left \{ {{5x+4y=75} \atop {x+y=18}} \right.

2) You can use the Elimination Method to solve it:

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\left \{ {{5x+4y=75} \atop {-5x-5y=-90}} \right.\\......................\\-y=-15\\\\y=15

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7 0
3 years ago
HELP EASY ASAP MULTIPLE CHOICE
Rudik [331]

Answer:

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Step-by-step explanation:

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Answer:

There are a variety of factors driving the

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example, in a 415V system, the L-N voltage

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voltage to 415/240 V three-phase (L-L/

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be powered with 240V single-phase (L-N)

without any intermediate transformation.

Removing the need for a transformer

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The adoption of a 415/240VAC distribution

model also can yield additional savings at

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Furthermore, while the typical efficiency

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Answer:

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Step-by-step explanation:

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