What is the equation of the line that passes through the points (1, 1) and (5, 5)?

y - x = 0
x - y = 0
-x - y = 0

You can model the population of a certain city between 1955-2000 by the radical function p(x)=55,000 sqrt x-1945. using this model, in which year was the population of that city 220,000

Aboat costs 19200 and decreases in value by 12% per year. how much will it cost in 5 years

Tan198=asin164=? how to solve this? ?