There were 128 threatened species of animals and 144 threatened species of plants in the united states in 2001. write the ratio of threatened species of animals to threatened species of plants as a fraction in simplest form.

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236