At the beginning of the day, stock XYZ opened at $8.18. At the end of the day, it closed at $6.88. What is the rate of change of stock XYZ?
A. -15.9%
B. 2.1%
C. -0.16%
D. 12.4%

-15.9%

Step-by-step explanation:

Opening stock = $8.18

Closing stock = $6.88

Loss = $1.30

Rate = - loss/opening stock × 100

= - 1.39/8.18 × 100

= - 15.9%

21.4 i did it already for s1

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."