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(a) Show that f(x) = x + 3x + 1 is one-one. (b) Find (f-)'(1) 2. Cobalt-60 has a half life of 5 years.


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(a) Show that f(x) = x + 3x + 1 is one-one. (b) Find (f-)'(1) 2. Cobalt-60 has a half life of 5 years. 10+5=15 Points (a) Find the mass that remains from a 100 mg sample after t years. (b) How long would it take for the mass to decay to 10 mg?

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