Joan has a part-time job at the mall. She works 4 hours every Monday, Wednes
day, and Friday. On Saturday she works 8 hours. What are her total hours per
week]

20 hours

Step-by-step explanation:

Given ,

She works

Monday = 4 hours

Wednesday = 4 hours

Friday = 4 hours

Saturday = 8 hours

Total = 4 + 4 + 4 + 8

= 20 hrs per week

Joane works 20 hours per week

- "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."