*URGENT PLEASE HELP*The total number of vertical feet that a climber has traveled varies directly with the number of hours she has been climbing. The constant proportionality is 600.

The answer is:
a) 300
b) 600
c) [tex]1.66*10^{-3}[/tex]
d) [tex]3.33*10^{-3}[/tex]
e) 2400
The explanation is shown below:
1. You have that the total number of vertical feet that a climber has traveled (which you can call [tex]y[/tex]), varies directly with the number of hours she has been climbing (which you can call [tex]x[/tex]), and the constant of proportionality is 600 ([tex]k=600[/tex]).
2. Keeping this on mind you can express it as following:
[tex]y=kx\\y=600x[/tex]
3. Now, substitute the values given in the table and solve for [tex]y[/tex] to calculate the number of feet or solve for [tex]x[/tex] to calculate the time in hours:
a) [tex]y=(600)(\frac{1}{2})=300[/tex]
b) [tex]y=(600)(1)=600[/tex]
c) [tex]x=\frac{1}{600}=1.66*10^{-3}[/tex]
d) [tex]x=\frac{2}{600}=3.33*10^{-3}[/tex]
e) [tex]y = (600)(4)=2400[/tex]