Because it is more efficient to produce larger numbers of items, the cost of producing a certain computer disks is inversely proportional to the number produced. If 4000 can be produced at a cost of $1.20 each. Find the cost per disk when 6000 are produced. How can I solve this problem?

- "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."

step-by-step explanation:

60: 45 =12: 9 =4: 3 so the answer is 4: 3

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