you bought some tile that cost $4.00 per square foot and some carpet that cost $2.00 per square foot. A total of 2500 ft.² was purchased for $6800. Your friend thought that you purchased 1600 ft.² of tile, and 900 ft.² of carpet. Decide if your friend is correct. If your friend is correct explain why. If your friend is not correct, explain the error for a reason

what is the graph

step-by-step explanation:

- "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."

b. 2 and 4

step-by-step explanation: