0.9^18 Portable -

( 0.9^{18} = 0.9^{16} \times 0.9^2 ) ( = 0.1853020188851841 \times 0.81 )

Let’s calculate ( 0.9^{18} ) step-by-step. 0.9^18

First, ( 0.1853020188851841 \times 0.8 = 0.14824161510814728 ) Then, ( 0.1853020188851841 \times 0.01 = 0.001853020188851841 ) Add them: ( 0.14824161510814728 + 0.001853020188851841 ) Sum: ( 0.15009463529699912 ) 0.9^18