Karen owns a seafood restaurant she orders trout from an online retailer each pound of trout costs $32 and the company charges a $4 fee for shipping the order however if Karen orders 10 or more pounds the trout costs only 425 per pound but the shipping fee is $9 which piecewise function models the cost of x pounds of trout

Its D if it is on Apex

28x+4, 0<x<=10

22x+8, x>10

- "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."