Marcos used 16 cups of flour to make 100 muffins. He divides to find how many cups of flour are needed for one muffin. Which shows the decimal point placed correctly in the quotient?

- "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."

i believe that the answer is

b. y-1=-2(x-4)

hope this !

you need to give us more information since we can't answer