Which expression is equivalent to 5x - 30

Sam makes his sales calls according to a pattern. he travels either north or south depending on the calendar. some of his past trips were as follows: on february 17, april 24, june 10, september 19, and november 3 he drove north. on february 28, may 25, august 22, november 20, and december 18, he drove south. describe sams' pattern. in which direction will sam drive on oct4 and oct 24?

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

In the equation sqrt(n+5)-sqrt(11-10)=1. what is the value of n