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Papessa [141]
3 years ago
7

The answer please...!!!

Mathematics
1 answer:
tatiyna3 years ago
5 0

Answer:

Answer is B.

Step-by-step explanation:

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Need help with this problem. ​
tigry1 [53]

Answer:

C) -\frac{47}{49}

Step-by-step explanation:

By the cos double angle formula, we know \cos(2\theta)=2\cos^2\theta-1. Substituting \cos \theta into the formula, we get

\cos(2\theta)=2(-\frac{1}{7})^2-1\\~~~~~~~~~~=\frac{2}{49}-1\\~~~~~~~~~~=\boxed{-\frac{47}{49}}.

The answer is C.

5 0
2 years ago
Solve these system of linear equations:
frutty [35]
1.solve for y
 2x+4y=12      
<u>  </u><span><u> -2x       -2x</u>
</span><u>4y</u>=<u>12-2x</u>
<u>4       4</u>
y=3-1/2x

step2 plug in y and solve for x
2x+8y=24
2x+8(3-1/2x)= 24
2x+24-4x=24
<u>-2x</u>=<u>0
</u><u>-2    -2</u>
 x=0
last step plug in x and solve for y

y=3-1/2x(0)
y=3

5 0
3 years ago
Which line has a constant proportionality of 4
Ne4ueva [31]

Answer:

Line A

Step-by-step explanation:

Line A has a constant of proportionality (slope) of 4.

3 0
3 years ago
Write a quadratic equation that has one solution, with an axis of symmetry of x=3​
slava [35]

i dont no 44444 but thanks for  the points

3 0
3 years ago
Pls help me with this
jok3333 [9.3K]
Answer would be: B.) 3/8 cup 
4 0
3 years ago
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