What made expansion so attractive to Americans? Why were Americans so land-hungry?

In the base year in a small island macroeconomy, nominal gdp was $400m. in a later year when the general level of all prices was twice as high, nominal gdp reached $1000m. between the base year and the later year: ( there can be multiple answers) -real gdp declined -there was real gdp growth by more than 100% - inflation occurred - there was real gdp growth but by less than 100%

Why are radio observatories located in valleys far away from urban centers? a. to shield them from electromagnetic interference b. to avoid sound pollution c. to avoid disturbing people living in the city d. to shield them from water vapor

The probability of rolling a sum of 7 when rolling two dice simultaneously is 0.167. you decide to test that probability by rolling th dice 12 times. what is the probability that exactly 2 of the rolls is a sum of 7?