Cylindrical container holds three balls. The diameter of the container is 4 in and its height is 10 in. The diameter of each ball is 3 in. What is the unused volume of the container? Use 3.14 for pi.

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil