What two numbers when added equal 25 and when multiplied = -200

If lmn=xyz, which congruences are true by cpctc? check all that apply

Suppose i flip two identical coins. what is the probability that i get one head and one tail?

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