John has earnes a 77, 76 and a 84 on his first three projects of the semester. if he hopes to have a b average (80 or above) what is the lowest score you can make on his fourth and final project?

36 is the final answer! : )

- 70

this is the answer for you hope it

- "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."

they would have to work 32 hours.