Apaperback book has a length of 6 in, a width of 9 in, and a height of 3 in. a book key chain is a 1/3 scale model of the book. what is the surface area ratio of the key chain to the book? *

answers

3

9

1/3

1/9

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

its a straight line parallel to the time axis