Please help I dont know how to do this

Aword processing program requires a 7- digit registration code made up of the digits 1,2,4,5,6,7 and 9 each number has to be used and no number can be used mor than once how many codes are possible

See attachment below and find the equivalent of tan(∠qsr)

Tom drove 206 miles in 3.9 hours. estimate his average speed.