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zloy xaker [14]

3 years ago

9

A robber drove out of town at 5am at 60mph. The policeman went in pursuit of him at 7am, traveling at 70mph. What time was it wh

en the policeman got within 10 miles of the robber?

1 answer:

Romashka [77]3 years ago

5 0

At 5 oclock 5pm just do trial and error

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Write the explicit formula that represents the geometric sequence-2, 8, -32, 128

maks197457 [2]

Well, since we know is a geometric sequence, we can always get the common ratio of it by simply dividing one value by the one behind it... so let's do so, with say hmm -32 and 8 -32/8 = -4 <-- our common ratio

the first term is -2

$\bf n^{th}\textit{ term of a geometric sequence}\\\\
a_n=a_1\cdot r^{n-1}\qquad 
\begin{cases}
n=n^{th}\ term\\
a_1=\textit{first term's value}\\
r=\textit{common ratio}\\
----------\\
a_1=-2\\
r=-4
\end{cases}\implies a_n=-2(-4)^{n-1}$

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