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aalyn [17]
3 years ago
9

Factor completely 4x^2-1

Mathematics
1 answer:
allochka39001 [22]3 years ago
4 0
<span>4x^2-1 = (2x +1)(2x - 1)

using a^2 - b^2 = (a+b)(a-b)

hope that helps</span>
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A medical study investigated the effect of calcium and vitamin supplements on the risk of older Americans for broken bones. A to
timofeeve [1]

Answer:

\frac{37}{389}

Step-by-step explanation:

Given that a  medical study investigated the effect of calcium and vitamin supplements on the risk of older Americans for broken bones. A total of 389 older Americans who lived at home and were in good health were studied over a three-year period. While all of the 389 people took in at least 700 milligrams of calcium and 200 units of vitamin D through their normal diet, 187 of them were given additional supplements containing 500 milligrams of calcium citrate and 70 units of vitamin D daily. Of the 187 who took additional supplements, 11 of them suffered broken bones over the three-year period. Of the 202 older Americans who did not take the additional supplement, 26 of them suffered broken bones over the study period.

                     Group I           Group II           Total

n                      187                  202                389

favour x             11                    26                  37

The fraction of older Americans who were included in the study suffered broken bones during the three-year period

=Total x/total n

= \frac{37}{389}

4 0
3 years ago
Find the next terms of the arithmetic sequence -25,-22,-19,-16,....
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Answer:

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Step-by-step explanation:

5 0
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3 years ago
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