Solve the following problems involving radicals.
1. The average amount of sewage discharged by a manufactory (in tons per month) from 2001 to 2010 can be modelled by the equation y = 235 where x is the number of years since 2000. In what year was about 610 tons of water discharged per month?
2. The side length of a square can be expressed by the formula a =  where s is the area of the square. If the area of a square is 40m2, what is length of the side? Round your answer to the nearest tenth.
3. Approximately the distance of d in miles that a person can see to the horizon is represented by the equation d=, where h is the height where the person is. How far can a man see if he is 5 meters above the ground? (1 mile = 1, 609.3 meters) plss yung maayus sana​