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Matlab Question

I want to plot higuchi vs time but when I raised e^(k*t) I get this error. Can you please show me how to plot this function vs time

thanks

>> t=[0:10:1600]; >> Ca=0.001; >> c0=0.01; >> d0=3*10^(-11); >> k=0.075; >> higuchi-sqrt((2 *Ca*c0*00* (e^ (k*t)-1))/k) Unrecognized function or variable 'e'. >> higuchi-sqrt((2*Ca*c0*00* (e^ (k*t)-1))/k) Unrecognized function or variable 'e'. >> higuchi-sqrt((2*Catc0*00* (exp^ (k*t)-1))/k) Error using exp Not enough input arguments. >> higuchi-sqrt((2*Ca*c0*00* (exp^ (k*t)-1))/k); Error using exp Not enough input arguments