Carl can do a particular job in 4 hours. It takes Mike 6.5 hours to do the samejob. How long will it take the boys to complete the job if they work together?
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.