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Sergio [31]
3 years ago
13

What is the explicit formula for this geometric sequence?8,4,2,1

Mathematics
1 answer:
bazaltina [42]3 years ago
6 0

C

the n th term formula ( explicit formula ) for a geometric sequence is

a_{n} = a_{1}(r)^{n-1}

where r is the common ratio and a_{1} the first term

here a_{1} = 8 and r = \frac{4}{8} = \frac{2}{4} = \frac{1}{2}

a_{n} = 8(\frac{1}{2})^n - 1  → C


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If you're using the app, try seeing this answer through your browser:  brainly.com/question/2790456

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\mathsf{sin\!\left(\dfrac{3\pi}{4}\right)}\\\\\\ =\mathsf{sin\!\left(\dfrac{3\cdot 180^\circ}{4}\right)}\\\\\\ =\mathsf{sin(135^\circ)}\\\\ =\mathsf{sin(180^\circ-135^\circ)}

=\mathsf{sin(45^\circ)}\\\\ =\mathsf{\dfrac{\sqrt{2}}{2}}\quad\longleftarrow\quad\textsf{this is the answer.}


I hope this helps.=)


Tags:  <em>sine sin common angles trig trigonometry </em>

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