Solve for a
[a+4 over 3 - a over 7= a+7 over 5} times 105

Which of the following statement about pascal's triangle are true?

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

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?