In a fish tank, 15 of the fish are guppies and 112 of the fish are goldfish. Which equation most closely estimates the fraction of fish that are guppies or goldfish in the fish tank?

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?

The difference between tax advoidance and tax evasion

Find the domain and range of the following function f(x) = 51x - 21+ 4