Alana and petra go to a used book sale where every book is the same price alana buys 4 books and petra buys 2 books they run into their friend angus who really loves to read and discover that he has brought 16 books angus received a $15 discount but he still spent $5 more than alana and petra combined how much does one book cost

answer: what do you mean

- "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."