PLEASE HELP ASAP What is the value of B for the following triangular prism?

48 in2
60 in2
65 in2
30 in2

Answer these questions showing your work plz

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 point of inflection for the function f(x)=2cos4x on the interval (0, pi/2)