Let the speed for the first 12 mi be x mi/h, the speed for 18 mi was (x+4) mi/h
thus given that
time=distance/speed
the average time will be:
3=(12+18)/(x+x+4)
3=30/(2x+4)
solving for x we get
3(2x+4)=30
6x+6=30
6x=24
x=4 mi/hr
Answer: 12 mi/hr
Answer:
The first graph.
Step-by-step explanation:
Algebra Calculator.
I believe the answer should be -4+x= -4x.
I hope this helps :)
A function can be represented on a table and on a graph.
The models of the linear relationship between f(x) and x are:

The given parameters are:


So, the function that models the linear relationship is:

Substitute known values

Evaluate all products

Rewrite as:

By comparing the above function to the list of options, we have the true options to be:

Read more about linear functions at:
brainly.com/question/20286983