Solve each equation in the interval from 0 to 2pi. Round your answer to the nearest hundredth. a. 3cos 4theta= -2
b. cos(pi theta)= -0.6

What is the value of r of the geometric series?

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

Points a, b, and c form a triangle. complete the statements to prove that the sum of the interior angles of triangle abc is 180