If the equation (lambda-1)x2 + (lambda + 1)x + (lambda-1) has real roots, then lambda can have in any value in the interval??

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

Given: pqrs is a parallelogram prove: pr and qs bisect each other at t

Find the values of the variables and the lengths of the sides of this kite.