{x|x is an odd counting number between 8 and 16} find n(a) for the sets of 3-6

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults. how many students and adults went if the ticket charge was $42.75

Is the square root of 4 plus the square root of 16 rational?

In a newspaper, it was reported that yearly robberies in springfield were up 25% to 265 in 2013 from 2012. how many robberies were there in springfield in 2012?