Notice that
, so
Then taking the positive square root gives
so 
and 
.
The answer is the product of 3 and the product of 4 and 12
The discontinuity occurs at x = 0, since that is the only "problem" place in the graph that makes the function undefined. A vertical asymptote exists there. It is nonremoveable.
Let s = northbound train
Then
2s = southbound train
:
Distance = time * speed
4s + 4(2s) = 600
:
4s + 8s = 600
:
12s = 600
:
s = 600/12
:
s = 50 mph is the northbound train
Then
2(50) = 100 mph is the southbound train
:
:
Check:
4(50) + 4(100) = 600
Hello!
To find the price of one marker you divide the price paid by the amount of markers bought
6 / 20 = 0.30
A marker cost $0.30
The answer is $0.30
Hope this helps!
