Does adding fertilizer affect the productivity of tomato plants? To answer this question, a gardener plants 24 similar tomato plants in identical pots in his greenhouse. He will add fertilizer to the soil in half of the pots. At the end of three months he will record the total weight of tomatoes produced on each plant. Identify the explanatory and response variables, experimental units, and treatments. Choose the appropriate term for each item below. experimental units tomato plants response variable use of fertilizer, no use of fertilizer treatments total weight of tomatoes explanatory variable fertlizer

i think that you should ask google for the answer to that problem because if we don't know it google does

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."

i believe it's a.

i'm not sure on this one, most likely correct.