exam Maths Puzzle Numerical Ability

Find the imaginary solutions: x^2 + 20x + 101 = 0

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exam Other Question

Discuss the advantages of using PEMDAS in simplifying an expression. Also, compare and discuss how you can have different answers to the same expressions with or without the applic A chemist needs to mix 20 liters of 40% salt solution with some 70% solution to get a mixture that is 50% salt. How many liters of 70% solution should be used?