A letter to Europe from the United States cost $.94 to mail a letter mailed within the United States cost $.44 Nancy mailed five letters for $3.70 some to Europe and some to the United States how many letters did she send to Europe explain how you can check your answer.

What multiplys to be 1 but adds up to be 4

How do u write a function for the reflection across the y axis

Identify all the cases where non-probability sampling is used when attempting to study the characteristics of a large city. studies on every subject in the population divide a population in groups and obtain a sample studies with a limited amount of time demonstrate existing traits in a population studies with the nth person selected