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Basile [38]
3 years ago
8

r. Rita needs to replace the ink cartridge for her printer. She found four brands that make replacement cartridges. The table be

low shows the prices and number of pages expected from each brand. Ink Cartridges Priče Brand Number of Pages 200 A B 125 $20.00 $25.00 $30.00 $35.00 C 150 250 Which brand is the best buy? ОА С в OC OD ​asp
Mathematics
1 answer:
Scilla [17]3 years ago
3 0
B Im not 100% sure but I hope I could help
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I need good tips to study for 2 tests next week
Airida [17]
Get some rest (8hours)
Get your clothes ready the night before
Drink cold water to keep you focused
Eat breakfast
Wear comfortable clothes
Hope you do well on your test
6 0
2 years ago
Write the equation of a line that is perpendicular to the given line and that passes through the given point. -x+5y=14; (-5,-2)
Vlad1618 [11]

Let\\\\k:y=m_1x+b_1\\\\l:y=m_2x+b_2\\\\l\ \perp\ k\iff m_1m_2=-1\\\\\text{We have}\ k:-x+5y=14\qquad|+x\\\\5y=x+14\qquad|:5\\\\y=\dfrac{1}{5}x+\dfrac{14}{5}\to m_1=\dfrac{1}{5}\\\\l:y=mx+b\to\dfrac{1}{5}m=-1\qquad|\cdot5\\\\m=-5\\\\l:y=-5x+b\\\\\text{Put the coordinates of the point (-5, -2) to the equation of the line}\ l:\\\\-2=-5(-5)+b\\-2=25+b\qquad|-25\\b=-27\\\\Answer:\ y=-5x-27\to5x+y=-27

3 0
3 years ago
Rationalise the denominator of (12)/(\sqrt(10)+\sqrt(7)+\sqrt(3))
jasenka [17]

Answer:

\frac{12}{\sqrt{10} +\sqrt{7} +\sqrt{3} }=\frac{6\sqrt{147} +6\sqrt{63}-6\sqrt{210}  }{21 }

Step-by-step explanation:

\frac{12}{\sqrt{10} +\sqrt{7} +\sqrt{3} }

=\frac{12\left( \sqrt{10} -\left( \sqrt{7} +\sqrt{3} \right)  \right)  }{(\sqrt{10}+(\sqrt{7} +\sqrt{3 } ))( \sqrt{10} -( \sqrt{7} +\sqrt{3}))}

=\frac{12\left( \sqrt{10} -\sqrt{7} -\sqrt{3} \right)  }{\sqrt{10^2} -(\sqrt{7} +\sqrt{3})^2}

\frac{12\left( \sqrt{10} -\sqrt{7} -\sqrt{3} \right)  }{10-(10+2\sqrt{21} )} }

=\frac{12\left( \sqrt{10} -\sqrt{7} -\sqrt{3} \right)  }{-2\sqrt{21} }

=\frac{-6\left( \sqrt{10} -\sqrt{7} -\sqrt{3} \right)  }{\sqrt{21} }

=\frac{-6\left( \sqrt{10} -\sqrt{7} -\sqrt{3} \right)  }{\sqrt{21} } \times\frac{\sqrt{21} }{\sqrt{21} }

=\frac{-6\sqrt{21} \left( \sqrt{10} -\sqrt{7} -\sqrt{3} \right)  }{21 }

=\frac{-6\sqrt{210} +6\sqrt{147} +6\sqrt{63}  }{21 }

=\frac{6\sqrt{147} +6\sqrt{63}-6\sqrt{210}  }{21 }

<u><em>Remark</em></u>:

You can simplify moreover if you want to.

5 0
2 years ago
Need some help, please. :)
Elden [556K]

Answer:

C

Step-by-step explanation:

Trust me on this ;V

I have the same problem,

6 0
2 years ago
A bedroom garbage can weighed 3/4 of a pound. A bathroom garbage can weighed 1/4 of a pound. Which is more
vivado [14]
3/4 of a pound. Why? 1/4 & 3/4 have the same denominator so you just compare the numerators. 3 is obviously bigger then 1 so there is your answer. If you were thinking about let's say cakes it would be the other way around. Would you rather share it with 3 people and get small pieces or share it with 1, which can basically be yourself.
8 0
3 years ago
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