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3 years ago

What is the recursive rule for this geometric sequence? 7, 21, 63, 189,…

Mathematics

1 answer:

Marysya12 [62]3 years ago

4 0

Answer:

The top choice is the answer. a1=7; an= 3*a_(n-1)

Step-by-step explanation:

Begin by finding out what the terms are multiplied by. It is a geometric sequence so multiplication is involved.

Take the 3rd term (63) and divide it by the second term.

63/21 = 3

What this means is that each term in the sequence is multiplied by 3 to get to the next term.

The first term is 7

So the answer is an = 3* a_n-1

The answer must be the top one. See if it works.

a2 = 3*a_(2 -1 )

a2 = 3 * a1

a2 = 3 * 7

a2 = 21 which it does.

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Lisa [10]

Answer:

The number is 95.

Step-by-step explanation:

Solution,

Let the number be 'x'.

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So we can frame it as;

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Now we solve it;

For solving it we will multiply both side by '5' using multiplication property and get;

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Andreas93 [3]

Answer:

Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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Answer:

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Hey There!

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4 years ago

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