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zheka24 [161]
2 years ago
14

Maria had 7 boxes. A week later there was a fire. After the fire she had 22 boxes how many boxes did Maria start with?

Mathematics
1 answer:
joja [24]2 years ago
4 0

Answer:

15

Step-by-step explanation:

Thank me and follow me plz

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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!

   

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3 years ago
A roll of paper towels contained 250 sheets. Each sheet was 8.75 inches long. How long was the roll?
aliya0001 [1]
250 × 8.75 = 2187.5 inches long
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What is the benefit of using a coordinate graph?
slavikrds [6]

Answer:

Step-by-step explanation:

The graph of a function on coordinate axes (x- and y- axes) provides a good, fast, visual feel for the behavior of the function as the independent variable (x) increases.

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(x-3)1/3 in its a simplest form
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