Express as a unit rate: 2400 miles in 48 hours.

Set up your data as a fraction.  You are looking to find the total number of miles traveled per hour.  This fraction would look like 2400/48.

You will need to reduce this with the GCF of both numbers.  The GCF for the two numbers is 48.  When you divide 2400 by 48 you end up with 50.  When you divide 48 by 48 it results in 1.  You found the "unit rate" of hours. 

This would then read as: the person/vehicle traveled 50 miles per hour (mph).

Hope this makes sense!  Good luck!

the formula of a slope:

from a table we have

substitute:

the slope of f(x) is -1.

the graph of funcfion g(x) is a horizontal line. the slope of a horizontal line is equal 0. therefore the slope of g(x) is 0.

-1 < 0

answer: the function g(x) has the greatest slope.