Whats the area for a circle with the circumference of 50.24

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

Write and solve a real word problem that involves determining distance on a coordinate plane

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?