I need help:( can you please help me with the answer

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

What is the value of x in the equation7x+2y=48 when y=3

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