(07.06 MC)

What is the value of z for the equation fraction 1 over 4z = −fraction 7 over 8 + fraction 1 over 8z? (5 points)
Select one:
a. −3
b. −7
c. 3
d. 7

Please explain answer

- "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."

what i would say the best answer is a. 40.5

answer: you need the equation in the question so i can answer it

step-by-step explanation: