book Maths Puzzle Numerical Ability

Is -10 a real number?

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book Other Question

decide if elimination and substitution can be used to solve any system emma and shane live 50 miles away from each other and decide to take their bicycles to meet. emma leaves at 7am towards Shane at 18 mph. shane leaves at 7:20am towards emma at 23 mph. how long is each person riding when they meet?