round 4x+4\leq9x+84x+4≤9x+8

What is the best approximation for the area of a circle with a radius of 4 m ? use 3.14 to approximate pi

Having a hard time understanding this question (see attachment).

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?