exam Maths Puzzle Numerical Ability

x+3y=2
-x+y=1

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exam Other Question

factor completely:

12x^3-3xy^2 1)solve 9*6t=9/36
2) solve In p=6.0
3) using the formula R-0.17 + 0.44 log N, determine how many choices would result in a reation time of 0.42 seconds. Round your answer to the nearest whole number.