Question how to solve

2^-a = 0,9

clear explanation please

24a - 2

thats no help ??

2^-a = 0,9 Take the log of both sides

-a log(2) =log(0.9) Divide both sides by log(2)

-a = log(0.9) / log(2)

-a =-0.152 Multiply both sides by (-1)

a = 0.152