I need help with this one

B. -1

Step-by-step explanation:

it is plainly visible.

the dot is one unit to the left (x- or Real-axis), which is -1.

and it is 3 units down (y- or Imaginary-axis), which is -3.

the number is therefore -3i - 1

the question was only for the real part (without any "impact" by an "i"), which again is -1.

- "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."

did you get the answer?