Lower prices can ... sales

Which sentence gives positive news?

When a graph shows no change we say that ...

The price of petrol ... every week since January.

Which of the following describes a downward trend?

When sales reach a peak ...

There have been fluctuations in price ...

Market analysts study... to follow the trend

What is the distance in meters to an obstacle, if the time of flight measured by an ultrasonic sensor is 8,0 milliseconds and the speed of sound is 343 m/s?

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