exam Maths Puzzle Numerical Ability

how do I give the opposite expression of: -x + 2z?

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exam Other Question

If Earthquake 1 measures 6.2 on the Richter scale, and Earthquake 2 measures 8.2 on the Richter scale, how many times bigger was Earthquake 2 than Earthquake 1? (Rephrased: By what factor was Earthquake 2 bigger than Earthquake 1?) A home purchased for 300,000 depreciated 8% over a 1 year period. What was the value of the home at the end of the year?