The waitress and the hostess at a restaurant share the tips at the end of the shift. the average amount earned in tips between the two of them is $75. the waitress gets $45 and the hostess gets $30. if they continue to earn money at this rate, how many dollars will the waitress receive if they earn $350 at the end of the shift?

- "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."