No. 6,447 in Russian
эффективна
Effective.
In a sentence
Новая методика обучения оказалась очень эффективна.
The new learning method turned out to be very effective.
In this sentence, "эффективна" is used as an adjective in the Russian language to indicate the effectiveness of a method, and it agrees in gender and number with the subject "методика".
Эта стратегия не столь эффективна, как ожидалось.
This strategy is not as effective as expected.
Here, "эффективна" serves the purpose of describing the strategy's effectiveness, being declined to match the feminine singular noun "стратегия".
Технология эффективна исключительно в лабораторных условиях.
The technology is effective only in laboratory conditions.
The word "эффективна" is used to describe the performance of the technology, complying with the singular and gender form of "технология".
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