Which equation could be used to calculate the sum of the geometric series?

1/3 + 2/9 + 4/27 + 8/81 + 16/243

The equation is:

The sum is:

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If the sequence is infinite, the formula is:

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Step-by-step explanation:

We must calculate the radius of the geometric series

The first term of the series is:

The last term of the series is:

If the sequence is finite then the formula is:

If the sequence is infinite then by definition as the radius  are then the formula for the sum of the geometric sequence is:

he spend 5.1 minutes chatting with his friends

step-by-step explanation:

2/5+1/2=9/10

6/1-9/10=5 1/10

the inequality is:

250c+180g≥950

step-by-step explanation:

let c denotes the number of days in a week   miyoko worked as a cryptographer.

and g denotes the number of days in a week she works as a geologist.

now we are given that she earns $250 for every day she works as a cryptographer,and earns $180 for every day she works as a geologist.

now miyoko's goal is to earn more than $950 this week.

hence, the inequality could be represented as:

250c+180g≥950