exam Maths Puzzle Numerical Ability

Brandon goes on a ACaub Scout hike and hikes to a waterfall in 3 hours and hikes back along the same route to the compground in 2 hours. If the hiking rate is 1mph faster returning than going, how fast are the boys hiking each way?

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y=x^2+2 can you pleaseeeee help me..

My problem says to state the domain for the function f (x)= x-2 divided by x+2

i dont understand how to do this at all.. if you could help i would greatly appreciate it