For 30

1. the speed of a current in a river is 6 mph. a ferry operator who works that part of the river is looking to buy a new boat for his business. every day, his route takes him 22.5 miles each way against the current and back to his dock, and he needs to make this trip in a total of 9 hours. he has a boat in mind, but he can only test it on a lake where there is no current. how fast must the boat go on the lake in order for it to serve the ferry operator's needs?
my no idea

2. the sum of the reciprocals of two consecutive positive integers is 17/72. write an equation that can be used to find the two integers. what are the integers?
my no idea

[(x^2-16)/(x^2+5x+6)]/[(x^2+5x+4)/( x^2-2x-8)]
3. what is the quotient in simplified form? state any restrictions on the variable.
a. [(x-4)^2]/[(x+3)(x+1)]; x cannot equal -3 or -1
b. [(x-4)^2]/[(x+3)(x+1)]; x cannot equal -4,-3,-2,-1, or 4
my i think it is a, but i thought that that restrictions were -4,-3,-2, and -1 but not 4.