Can anybody please help me ?

If you roll two fair dice (one black die and one white die), in how many ways can you obtain a 4 on at least one die?

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

Acone with radius 5 cm and height 12 cm how many cm ?