Identify the “rule” for the following sequence and give the next three terms: 28, 14, 7, 3.5, .. Would the sequence be geometric, arithmetic, or neither?

Step-by-step explanation:

r = a₃/a₂ = 0.5

a₅ = a₄r = 3.5×0.5 = 1.75

a₆ = a₅r = 1.75×0.5 = 0.875

a₇ = a₆r = 0.875×0.5 = 0.4375

step-by-step explanation:

this is not a question

- "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."