Is 6 sqaured a rational number

[15 points, algebra 2]simplify the complex fraction and find the restrictions.

Acoffee shop orders at most $3,500 worth of coffee and tea. the shop needs to make a profit of at least $1,900 on the order. the possible combinations of coffee and tea for this order are given by this system of inequalities, where c = pounds of coffee and t = pounds of tea: 6c + 13t ≤ 3,500 3.50c + 4t ≥ 1,900 which graph's shaded region represents the possible combinations of coffee and tea for this order?

What is the effect on the graph of the function f(x) = x2 when f(x) is changed to f(x) − 4?