Rex is four times as old as ted. if the sum of their ages is 30, how old is ted?
a: 5
b: 8
c: 10
d: 6

choice b is correct

step-by-step explanation:

we have been given the following system of linear inequalities;

we are required to graphically determine the solution to these system of inequalities. using a graphing tool, the solution is as shown in the attachment below;

225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225