How did the us learn about the missiles being in cuba?

Lots of points: economics: the is the dollar value of all final goods and services produced within a country’s borders within a given year. a. gross domestic product b. business cycle c. inflation rate d. net exports

Read the paragraph and answer the question that follows: the town of belmond, iowa, needs to add weather sirens. the loud and steady wail would warn citizens of approaching danger. if past history is an indication, the sirens will save hundreds of lives. with a prediction of a deadly storm season, the alert which sentence should be revised to eliminate redundancy? the town of belmond, iowa, needs to add weather sirens. the loud and steady wail would warn citizens of approaching danger. if past history is an indication, the sirens will save hundreds of lives. with a prediction of a deadly storm season, the alert system is needed immediately.

What does one prolonged blast and one short blast mean?