1. $N_o$
2. $N_o$
4. $N_o$

5. $$\color{blue}{\rightarrow}\color{black}\;N_o \;= \;N\cdot e^{\lambda t}$$

1. $N$
2. $N$
4. $N$

5. $$\color{blue}{\rightarrow}\color{black}\;N \;= \;N_o\cdot e^{-\lambda t}$$

1. $t$
2. $t$
4. $t$

5. $$\color{blue}{\rightarrow}\color{black}\;t\;= \;\frac{1}{\lambda} \cdot ln\frac{N_o}{N}$$

1. $\lambda$
2. $\lambda$
4. $\lambda$

5. $$\color{blue}{\rightarrow}\color{black}\;\lambda\;= \;\frac{1}{t} \cdot ln\frac{N_o}{N}$$

   $$\color{blue}{\rightarrow}\color{black}\;\lambda\;= \;\frac{ln2}{T_{1/2}} $$

1. $T_{1/2}$
2. $T_{1/2}$
4. $T_{1/2}$

5. $$\color{blue}{\rightarrow}\color{black}\;T_{1/2}\;= \;\frac{ln2}{\lambda} $$

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If you want to introduce for example $1,6\cdot 10^{-9}$ type: 1.6E-9