All numbers, positive, negative, and 0, that are not irrational what is it called

Acompany is making new soccer uniforms for a team. the company uses 2.5 yards of fabric for each shirt. the company uses 82.5 yards of fabric to make shirts and shorts for 15 players. the equation and solution below represents the situation. 15(2.5+x)=82.5; x=3 what does the solution, x=3, represent?

For the feasibility region shown below find the maximum value of the function p=3x+2y

What are the solutions of the equation x4 – 5x2 – 14 = 0? use factoring to solve. someone !