Help please is for Algebra

Twelve less than a number is at most 20

Reagan lives five miles farther from school than vanessa lives. write an expression to describe how far reagan lives from school

Given that y varies directly to the square root of (x + 1), and that y = 1 when x = 8,(a)express y in terms of .x,(b)find the value of y when x = 3,(c)find the value of x when y = 5.