In an experiment, a tomato plant is fertilized everyday with 0.2g of grobig fertilizer. the researcher wants to show the effect of daily fertilizer on plant growth. what type of graph should she use to best demonstrate this daily improvement?
a) pie graph
b) bar graph
c) line graph
d) pictograph

2.susie places 3 beakers in the freezer. the first beaker contains water only, the second contains water and salt, and the third contains a water and sugar solution. susie recorded the temperature and the time at which each mixture froze. which is the most appropriate hypothesis for her experiment?
a) salt affects the freezing point of water.
b) the addition of salt raises the freezing point of water.
c) the addition of a sugar lowers the freezing point of water.
d) the addition of different substances affects the freezing point of water.

Explanation:

In the first problem, we have an experiment where a stimulus is constantly being applied to see results. This experiment should be drawn using a line graph, because this type of graph will show the linear relation between the two variables, that is, the fertilizer and the plant growth. Through this graph, you would observe is the relation is directly proportional or inversely proportional.

So, the first answer is C. line graph.

In the second problem, the best hypothesis would be D. the addition of different substances affects the freezing point of water, because the experiment include 1 beaker with just water, and two other beakers with different substances in them, this means that the researcher wants to know if different substances changes the freezing point.

If the experiment have only salt or only water, the possible hypothesis would be around the change of the freezing point due to a specific substance, but that's not the case here.

Therefore, the answers are C and D.