First calculate his gross salary after his 401k contributions:

Then find the amount of taxes withheld:

5,760 dollars went towards taxes.
Answer:
7 will be the value of x in the question
The areas of the circle will represent the population, so:
Area = πr²
5² : 19,465,000
C² : 37,691,000
California circle radius = 6.96 cm
For Texas:
5² : 19,465,000
T² : 25,675,000
Texas circle radius = 5.74 cm