Answer:
The correct answer is -
- to match the mystery food sample to a definite positive result (gelatin, oil.)
- to match the mystery food sample to a definite negative result (water)
Explanation:
Adding an indicator or any indicator to an unknown food sample or any sample and then adding the same indicator to the known sample is necessary to check and confirm the positive result and negative result that will help to match with the experiment result.
For positive result adding an indicator to get a definite positive result to mystery food for example gelatin or oil. Similarly for a definite negative result adding it to known food or water.
The question relates to calculating speed through the formula 'averagespeed = total distance/ total time'. LeBron and George are using this method on a 150-meter skateboard trip, recording the time it takes for each equal section. The situation mirrors similar examples, such as Jill's flyer distribution and the store trip.
The subject of the question seems to be about calculating speed using the formula for speed, which is distance/time. In LeBron's case, he and his friend George are observing and recording the time it takes LeBron to coast a distance of 150 meters on his skateboard. They have divided the total distance into equal sections and noted down the time for each section.
To find the average speed, we would need to total all the times and divide the total distance by this time. This method of calculation is similar to the example provided, where Jill had a total trip distance and total trip time and was able to find her average speed by dividing distance by time, and it also closely mirrors the definition of averagespeed highlighted in the second example.
#SPJ1