exam Maths Puzzle Numerical Ability

Jenny and Greg have both agreed to mow half of a lawn. This lawn is a rectangle, 25 feet by 45 feet. Their lawn mower cuts a 2 feet wide path. If Jenn starts at a corner and makes

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I need help please...I dont understand....it reads as follows:
L varies inversely as W. Find the constant of variation if L=40 and w=50
What is the definition for domain? How can you figure out what f(x) = 7x + 2 for the domain {-4, -1, 0, 1, 5} is?