Original price of a comic book : $2.95 discount 10% tax 5%

International calls require the use of a country code. many country codes a 3-digit numbers. country codes do not begin with a 0 or 1. there are no restrictions on the second and third digits. how many different 3-digit country codes are possible?

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)