step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:
Answer from: Quest
hello from mrbilldoesmath!
answer: x (x+6)^2, choice b
discussion:
factor x out of the equation:
x^3 + 12x^2 + 36x = x (x^2 + 12x + 36).
note that 6+6 = 12 and 6*6 = 36 so the above factors into:
x (x+6)^2
which is choice b
you,
mrb
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