exam Maths Puzzle Numerical Ability

Factoring Trinomials by Trial and Error
18x^3y+36x^2y-32xy

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exam Other Question

In the sum of the expression 7 + 77 + 777 + 7777 + ... + 7,777,777,777,777,777,777, what will the digit in the tens place be? Given a mean (8.0 hours) and a standard deviation (4.5 hours) of a population, calculate the probability of an event that falls between 5 to 10 hours. This question is due on day 5.