What are the excluded value(s)? (y^(2)+1)/(y^(2)-y-6) (-2, 3) (-1, 6) (-2, -6)

Which expression gives the area of the triangle shown below

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?

Simply 8x squared + 5(7x squared- x) - 2x =