Given, distance between South Carolina and Texas = 
Distance between Texas and California = 
Let's assume, both the distance is same.

=> 
=> 
=>
Plug x = 113 in 
Miles.
Similarly,
miles
Since 2500 divided by 2 = 1250 miles, hence our assumption was correct, Texas lies between both the cities.
Between 1994 and 1998 the population increased by 5 miliion, approximately 1 1/4 million a year.
2016 - 1998 = 18 years at 1 1/4 million a year = 22 1/2 million
Estimate therefore is: 81 + 22 1/2 = 103 !/2 million
You will need to show all the answers that are at 25 or less.
Please see the attached paper for the inequality and the graph of the possible solutions.
A filled in circle means to include that value.
See the attached for a graph and the solution: (x, y) = (3, 0).
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With the availability and simplicity of the Desmos on-line graphing calculator, this is my favorite method of solving systems of equations.