exam Maths Puzzle Numerical Ability

y=- x-2 -2
There are brackets in front of the x and behind the -2. So how would I graph the equation.

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Two cars leave towns 230 km apart at the same time, traveling directly toward one another. One car travels 15km per hr slower than the other. They pass one another 2 hours later. What are their speeds? What is an equivalent expression for sqrt5(1/25)^(x+1) ??? I think the answer is 5^(-x-1) ?????