How many triangles can be constructed with angle measurements of 90, 45, and 50?

Can someone me out here and the tell me the greatest common factor

Jayne is studying urban planning and finds that her town is decreasing in population by 3% each year. the population of her town is changing by a constant rate.true or false?

Convert (-3,0) to polar form. a. (3,0’) b. (-3,180’) c. (3,180’) d. (3,360’)