Awooden plank of length x is cut into 8 sections such that each section is at most 2 1/2 meters long. what is the length of the entire plank in meters?
x ≤ 3.2 meters
x ≤ 20 meters
x ≥ 10.5 meters
x ≥ 20 meters

the answer is c

hope this !

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)