Which of the following is example of perpendicular lines

Wich statement could be used to explain why the function h(x)= x^3 has an inverse relation that is also a function

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 output, or dependent variable of quantity? 1: x 2: f(x) 3: y