find constants a and b such that the function y = a sin(x) + b cos(x) satisfies the differential equation y'' + y' − 4y = sin(x).

Find the area of shaded region z=-0.89

Alex determined that his average speed when he commuted to work is 35 miles per hour. what conversion factor can be used to convert this speed to feet per hour?

Astudy group should stay around 3-6 people. true or false