(MIDDLE SCHOOL MATH) (MORE THAN 5 POINTS!) HELP PLEASE

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?

Which graph has figures that can undergo a similarity transformation to justify that they are similar? (obviously not the third one)

What unit of been sure would be appropriate for the volume of a sphere with a radius of 2 meters