How to do elimination by Timesing
2 answers:
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Answer:
700 lei
Step-by-step explanation:
You have a geometric sequence for which you know the common ratio and the last term.
There are only three terms, so you can solve the problem in either of two ways.
1. The brute force method (easiest for only a few terms)
Each term is half the one before it, so each term is double the one after it.
3rd term = 100 lei
2nd term = 200
1st term = 400
Total = 700 lei
Oana spent 700 lei
2. Using formulas (best for longer sequences)
The general formula for your sequence is
aₙ = a₁rⁿ⁻¹
For your sequence,
a₃ = 100; r = 0.5
(a) Calculate a₁
Set the last term equal to the general formula.
a₃ = a₁(0.5)ⁿ⁻¹
100 = a₁(0.5)² = 0.25a₁
a₁ = 100/0.25 = 400
(b) Calculate the sum
The general formula for the sum of a geometric sequence is
Oana spent 700 lei.
Hello, My Dear Friend!
Solution for
equation:
<span>Simplifying:
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<span>
</span><span>Reorder the terms:
</span>
<span>
</span><span>Solving:
</span>
<span>
</span><span>Solving for variable 'x'.
</span>Move all terms containing x to the left, all other terms to the right.
<span>Add '12' to each side of the equation.
</span>
<span>
</span>Combine like terms:
<span>
</span><span>Combine like terms: </span>
<span>
</span><span>Divide each side by '20'.
</span>
<span>
</span><span>Simplifying:
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Therefore, THAT is The Answer!^^^
</span>=====> x = 3 <=====
I Hope my answer has come to your Help. Thank you for posting your question here in
We hope to answer more of your questions and inquiries soon. Have a nice day ahead! :)
<span>
</span>
Solution for
<span>Simplifying:
</span>
</span><span>Reorder the terms:
</span>
</span><span>Solving:
</span>
</span><span>Solving for variable 'x'.
</span>Move all terms containing x to the left, all other terms to the right.
<span>Add '12' to each side of the equation.
</span>
</span>Combine like terms:
</span><span>Combine like terms: </span>
</span><span>Divide each side by '20'.
</span>
</span><span>Simplifying:
</span>
Therefore, THAT is The Answer!^^^
</span>=====> x = 3 <=====
I Hope my answer has come to your Help. Thank you for posting your question here in
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