exam Maths Puzzle Numerical Ability

Write three quadratic equations, with a, b, and c (coefficients of x2, x, and the constant) as:
1. Integers
2. Rational numbers
3. Irrational numbers

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exam Other Question
At exactly what time (to the fraction of a minute) between 7:00 and 8:00 do the hands of a clock form a straight angle? Solve, show property used(associative, communative, and distributive)and show all steps.

15.) (45•32)•0

17.) 50•(118•20)

19.) (25•78)•4