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Decay rate(dc/dt)= -kc

Where (dc/dt) is the change in mass, (k) is a constant with units of (day^-1), and (-kc) is the decrease by decay.

a-use euler's method to solve this eq from t=0 to 1 day with k=0.2 day^-1. Employ a step size of Delta t = 0.1 day. The concentration at t=0 is 10 Bq/L.

b-plot the solution on a semilog graph (ie (ln c) versus (t) and determine th slope.

I am at a loss at where to begin or accomplish this.