Answer:
The Second one y=1/3x
Step-by-step explanation:
Because when you substitute x by 3 ( for example) then, you get y = 1
and that's right from the graph.
Answer:
x=143/40
or
x=3.575
Step-by-step explanation:
Root 78 would go Between 8 and 9
Answer:
The function is 
domain is 0 to 0.2 hour.
range is 0 to 2 miles.
Step-by-step explanation:
Given that,
Average velocity = 10 miles/hour
Time = 12 min = 0.2 hour
We need to write a function that models the student's distance from home
Using formula of distance

Where, v = velocity
t = time
d = distance
Put the value into the formula

This is a function.
We know that,
Domain :
Domain shows the time.
So, domain = 0 to 0.2 hour
Range :
Range shows the distance.
The range at t =0,
Put the value of t in the function

The range at t =0.2 hour


So. range = 0 to 2 miles
Hence, The function is 
domain is 0 to 0.2 hour
range is 0 to 2 miles