book Maths Puzzle Numerical Ability

How do you subtract and add negative numbers?

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book Other Question

What is the cost in dollars to steam clean a room W yards wide and L yards long it the steam cleaners charge 10 cents per square foot? when i am trying to get a line that is parallel to a line that is going through a set of given points, when do i use the rule that tells me to use opposite sign and flip the number upside down in my equation?