Find the 80th term of the following arithmetic sequence.
17, 26, 35, 44,

728

Step-by-step explanation:

formula is

Tn= a+(n-1)d

where a is the first term, d is the common difference and n is the term you are looking for

ddsf

step-by-step explanation:

dfs

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)