Match each item with the correct unit price. PLEASE HELP MATH QUESTION

Step-by-step explanation:

1). for one dollar.

  Unit rate =

                  = $0.40

                  ≈ 40 cents each

2). $3.8 for 6

  Unit rate =

                  = $0.63

                  ≈ 63 cents each

3). 20 for $1.56                

  Unit rate =

                  = $0.078

                  = 7.8 cents each

4). for $1.58

   Unit rate =

                  = $1.05 for each

5). 5 at $3.90

   Unit rate =

                   = $.78

                   ≈ 78 cents for each

- "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."

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.