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kicyunya [14]
3 years ago
7

Every student in the senior class is taking history or science. There are $200$ seniors in the class. If there are $126$ seniors

taking history and $129$ seniors taking science, how many students are taking both history and science?
Mathematics
1 answer:
aniked [119]3 years ago
4 0

Answer: 55

Step-by-step explanation:

126+129= 255

255-200=55

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Step-by-step explanation:

The number of mice vary inversely with cats. This is written as:

Mice \propto \dfrac{1}{Cat} \\Mice = \dfrac{k}{Cat}

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When there are 6r-27 mice, there are r-5 cats.

6r-27 = \dfrac{k}{r-5}\\$Cross multiply$\\k=(6r-27)(r-5)

Taking the values of k above, we have:

k=(3r-19)(2r+1) =(6r-27)(r-5)\\(3r-19)(2r+1) =(6r-27)(r-5)\\6r^2+3r-38r-19=6r^2-30r-27r+135\\$Collect like terms\\6r^2-6r^2+3r+30r-38r+27r-19-135=0\\22r-154=0\\22r=154\\$Divide both sides by 22\\r=7

Therefore:

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Step-by-step explanation:

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The answer would be 21.248 miles

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How would you solve this? You are trying to find x
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Step-by-step explanation:

Let x represent the amount of medical bills that Giselle has to pay.

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