Which sentences use affect or effect correctly? Select all that apply.
Cold weather can affect battery life.✓Правильный ответ
The update had an affect on speed.
The medicine produced an unwanted effect.✓Правильный ответ
Noise may effect my existing concentration level by influencing it slightly.
Объяснение
The valid sentences use affect as a verb meaning influence and effect as a noun naming a result. The update sentence needs the result noun after an, while the noise sentence explicitly describes influence on an existing state instead of bringing one about.