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3 years ago

What is the explicit rule for the geometric sequence?

Mathematics

2 answers:

makvit [3.9K]3 years ago

6 0

The answer is C. The formula for a geometric sequence is an = a1*r^n-1. If we plug in our numbers, we get an = 400*1/2^n-1. That is the same as C.

ANTONII [103]3 years ago

4 0

Answer:

an = 400*(1/2)^(n - 1) which is C is the most common answer.

Step-by-step explanation:

What did you have to do to get 400 as the first term?

There are two answers.

an = 400 * (1/2)^(n - 1)

an = 400 * (1/2)^n

Which one is the answer?

The answer is the one that leaves 400 as the first term.

a1 = 400*(1/2)^(n-1) should be the answer.

400*(1/2)^n is unfortunately sometimes used. In which case, the first term is a^0

A1 = 400 (1/2)^(n - 1) is the usual for that describes the series.

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2 years ago

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4 years ago

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Answer:

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Step-by-step explanation:

Let

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Number of hours Allison worked washing cars last week = y

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$x-y=3$

<u>Lifeguarding:</u>

$12 per hour

$12x in x hours.

<u>Washing cars:</u>

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$8y in y hours.

2. Allison earned a total of $96, hence

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You get the system of two equations:

$\left\{\begin{array}{l}x-y=3\\ \\12x+8y=96\end{array}\right.$

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3 years ago

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Answer:

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3 years ago