At a gathering of 10 people, there are 4 people who all know each other and 6 people who know no one. People who do not know each other shake hands. How many handshakes occur?

If 2(a^2+b^2)=(a+b)^2 then, > a+b=0, > ab=0, > a=b, > 2a=b

1) you deposit $2,500 in an account that earns 4% simple interest. how much do you earn in eight years?

The map shows the location of the airport and a warehouse in a city. though not displayed on the map, there is also a factory 112 miles due north of the warehouse.a truck traveled from the warehouse to the airport and then to the factory. what is the total number of miles the truck traveled?