Scientist are technical persons and they can understand the language of science and measurements. The sentence, "Using a low - flow shower instead of a high - flow shower heads saves about 3 gallons of water per minute."
So by the language the above sentence is purely technical language. It says we can save approximately 3 gallons of water in one minute if we choose to use a low flow height instead of using high flow height of water shower flow.
A farmer, a politician or a meteorologist may not find some useful information from the above sentence. Hence the answer is Scientist.
4 significant figures. Use a rule called the Atlantic-Pacific rule where if the period is absent (Atlantic), you would start counting the numbers from right to left. If the period is present (Pacific), then start counting the numbers from left to right. Since the period is present, start from 5 and there are 4 digits including 5.
