What is the domain of y = sec(x)? all real numbers
all real numbers except
nx+
2,
where n is any integer
all real numbers except ns, where n is any integer
all real numbers except nx and nx+
2,
where n is any integer

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)