How many combinations of 5 students can a teacher choose from 30 students

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

How long does it take natsumi to clean up after she is done? table: .area time30. 245. 2.7560. 3.5

Find the values of the variables in the kite