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vichka [17]
3 years ago
13

the price of a share of a company's stock has been decreasing at a constant rate of $0.50 per share every half hour. if the pric

e of the share of stock is now $25, for how many hours has the price been below $30 per share
Mathematics
1 answer:
Lady_Fox [76]3 years ago
4 0

It should be for 5 hours if $30 is what they started with

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Step-by-step explanation:

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As average speed= (total distance)/(total time)

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\bf \qquad \qquad \textit{sum of a finite geometric sequence}\\\\
S_n=\sum\limits_{i=1}^{n}\ a_1\cdot r^{i-1}\implies S_n=a_1\left( \cfrac{1-r^n}{1-r} \right)\quad 
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a_1=-2\\
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n=6
\end{cases}
\\\\\\
S_6=-2\left( \cfrac{1-5^6}{1-5} \right)
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