Mary purchased 4 tires by mail order. She paid ​$54.70 per tire plus​ $5.90 per tire for shipping and handling. There is no sales​ tax, because the tires were purchased out of state. She also had to pay​ $7.06 per tire for mounting and balancing. At a local​ store, Mary's total for the 4 tires with mounting and balancing would be ​$324 plus 6​% sales tax. How much did Mary save by purchasing the tires through the​ mail?

15

step-by-step explanation:

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your answer would be 12

- "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."