The ratio of 7th graders to 8th graders in a club is 8 to 3. If there are fifteen more 7th graders than 8th graders, find the number of students represented in each grade

23 to 3

Step-by-step explanation:

you add 15 to the seventh graders because its fifteen more seventh graders

- "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."