Hey, my name is esteban and i'm not really good in maths so here's the problem : A= -2/5 : 3/15 + 2/15 B= 9/2 - 5/2 : 15/8

if you could explain all the calculations it would help me a lot

Thanks-you

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?