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Solnce55 [7]
3 years ago
13

Determine whether the lines are parallel, intersect, or coincide y=-7x-+1 y=-7x-3

Mathematics
1 answer:
Diano4ka-milaya [45]3 years ago
7 0

Answer:

Parallel

Step-by-step explanation:

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Which ordred pair is in the solution set of 4x + 8y>16 ?
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The perimeter of a rectangle is 46 inches. If the width of the rectangle is 9 inches, what is the length?

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Savannah was paid $87 for 12 hours of babysitting and $65.25 for 9 hours. What is the constant of proportionality that describes
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Find the value of sin(a/2) if cosa= 12/13<br>​
daser333 [38]

Answer: sin\frac{a}{2} = ± \frac{1}{\sqrt{26} }

Step-by-step explanation:

We very well know that,

cos2A=1−2sin²A

⟹ sinA = ±\sqrt{(1-} \frac{cos2A}{2} )

As required,  set A = \frac{a}{2}   &   cos a=  \frac{12}{13}    ,thus we get

sin \frac{a}{2} =± \sqrt{\frac{1-cos a}{2} }  

∴ sin\frac{a}{2} =±\sqrt{\frac{1-\frac{12}{13} }{2} } = ± \frac{1}{\sqrt{26} }

   since ,360° < \frac{a}{2} <450°

             ,180° < \frac{a}{2} <225°

Now, we are to select the value with the correct sign. It's is obvious from the above constraints that the angle a/2 lies in the III-quadrant where 'sine' has negative value, thus the required value is negative.

hope it helped!

   

5 0
3 years ago
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Evgesh-ka [11]

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that is because 96 is rounded too 100

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