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AleksandrR [38]
3 years ago
13

You lost your cell phone and have to use a phone booth. The call will cost $0.25 for the first minute and

Mathematics
2 answers:
Leno4ka [110]3 years ago
8 0

.85=.25+.15x
.6=.15x
4=x
but final answer is 5 minutes due to the first call costing more
ElenaW [278]3 years ago
7 0

Answer:

4 minutes

Step-by-step explanation:

make equation

0.25+(0.15x)= 0.85

solve for x

0.15x= 0.60

x=4

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Answer:

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Step-by-step explanation:

\cos\theta =\frac{-2}{5}

As both sin\,\theta,

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In the third quadrant,

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\sin\,\theta =-\sqrt{1-\cos^2\,\theta} \\=-\sqrt{1-(\frac{-2}{5})^2 } \\\\=-\sqrt{1-\frac{4}{25} }\\\\=-\sqrt{\frac{25-4}{25} }\\\\=-\frac{\sqrt{21} }{5}

\tan\,\theta = \frac{\sin\,\theta}{\cos\,\theta }\\\\=\frac{\frac{-\sqrt{21} }{5} }{\frac{-2}{5} }\\\\=\frac{\sqrt{21} }{2}

\sec\,\theta =\frac{1}{\cos\,\theta }\\\\=\frac{1}{\frac{-2}{5} }\\\\=\frac{-5}{2}

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\cot\,\theta =\frac{1}{\tan\,\theta}\\\\=\frac{1}{\frac{\sqrt{21} }{2} }\\\\=\frac{2}{\sqrt{21} }

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