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gtnhenbr [62]
3 years ago
11

Which statement about the following graph is correct?

Mathematics
1 answer:
Vilka [71]3 years ago
4 0
Can you plz attach an image of the graph :O
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Find the exact value of cos(7\pi /12)
Naya [18.7K]

7π/12 lies in the second quadrant, so we expect cos(7π/12) to be negative.

Recall that

\cos^2x=\dfrac{1+\cos(2x)}2

which tells us

\cos\left(\dfrac{7\pi}{12}\right)=-\sqrt{\dfrac{1+\cos\left(\frac{7\pi}6\right)}2}

Now,

\cos\left(\dfrac{7\pi}6\right)=-\cos\left(\dfrac\pi6\right)=-\dfrac{\sqrt3}2

and so

\cos\left(\dfrac{7\pi}{12}\right)=-\sqrt{\dfrac{1-\frac{\sqrt3}2}2}=\boxed{-\dfrac{\sqrt{2-\sqrt3}}2}

7 0
3 years ago
!!please help asap!! How does writing an equation help you solve problems with percentages?​
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Percent problems can be solved by writing equations. An equation uses an equal sign (= ) to show that two mathematical expressions have the same value. Percents are fractions, and just like fractions, when finding a percent (or fraction, or portion) of another amount, you multiply. ... Percent of the Base is the Amount.
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Bc¯¯¯¯¯ is parallel to de¯¯¯¯¯. what is ab? enter your answer in the box.
svetlana [45]
This can help you to understand it

7 0
3 years ago
A six-sided, fair number cube is rolled 100 times as part of an experiment. The frequency of the roll of the number 3
grandymaker [24]
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A library checks out four fiction books and two nonfiction books an hour. How many times more fiction books do they check out th
Scorpion4ik [409]

Answer:the library checks out 2 times more fiction books than the nonfiction books.

Step-by-step explanation:

Total number of fiction books that the Library checks out in an hour is 4.

Total number of non fiction books that the Library checks out in an hour is 2.

To determine how many times more fiction books that they check out than the nonfiction books, we would divide the total number of fiction books that the Library checks out in an hour by the total number of non fiction books that the Library checks out in an hour. It becomes

4/2 = 2

4 0
3 years ago
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