I believe it's B. If you graph, then you put a vertical line. If there are 2 points on the line, it's not a function. Every x-value has 1 y-value for a function. Hope this helps! ;)
You have 360+360*20%=360+360*20/100=360+72
So you have 432
Distance=speed times time
distance/time=speed
distance=30km
time=2.5hr
distance/time=30km/2.5hr=60km/5hr=12km/1hr=12km/hr
her speed is 12km per hour
Sqrt(-2), can be written as i * sqrt(2). Thus, our answer is x - i sqrt(2).
