Which of the following scenarios describe proportional relationships? Check all that are true.

A punch recipe requires 8
4
5
ounces of sorbet for each gallon of lemon-lime soda.

The bakery sells doughnuts at $2.75 for each
1
2
dozen.

Jon earns 7 hours of vacation time for every 80 hours he works.

Cicely swims 5
1
2
kilometers on Wednesday, 10
1
4
kilometers on Thursday, and 7
3
4
kilometers on Friday.

step-by-step explanation:

where is the questions

the answer is 31.27mph

- "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."