What is the slope of the line?

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

The taxi fare in gotham city is $2.40 for the first 1 2 12 mile and additional mileage charged at the rate $0.20 for each additional 0.1 mile. you plan to give the driver a $2 tip. how many miles can you ride for $10?

What is the value of x in the equation 1/5x - 2/3y = 30 , when y = 15