Describe what each letter/sign does to the graphs of the parent 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?

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2

Find the value of x to the nearest tenth.