Which term describes a function in which there is a common difference between each y-value?

Identify a1 and r for the geometric sequence an= -256(-1/4) n-1

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

Which of the following represents the length of a diagonal of this trapezoid?