Please help me with what you can and show your work. ( preferably on paper)

What is the percent of increase for a population that changed from 438,000 to 561,000

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

Iwill give you ! what is the measure of ∠v ?