What is the measure of the remaining angle in a triangle if the two other angles have measures of 90 degrees, and 40 degrees? A: 40 degrees
B: 30 degrees
C: 50 degrees
D: 60 degrees

Aresearch study is done to find the average age of all u.s. factory workers. the researchers asked every factory worker in ohio what their birth year is. this research is an example of a census survey convenience sample simple random sample