9. A fitness club charges a membership fee of $79, in addition to a $59 monthly fee. Determine
the number of months for which the average monthly cost of the fitness club charges is less
than $64.

(c, 0) i might be wrong so don't put full faith on my answer

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)