A Flea Collar For Dogs Contains An Active Ingredient That Evaporates At A Rate Propor Tional To The Amount Still Presen 1 (29.29 KiB) Viewed 51 times
Days Effective
A. 16.83
B. 18.83
C. 20.83
D. 17.83
E. 19.83
A flea collar for dogs contains an active ingredient that evaporates at a rate propor- tional to the amount still present. Half of the ingredient evaporates in the first 15 days af- ter the collar is removed from the protective packaging. If the collar becomes ineffective after 60% of the active ingredient has evaporated, how many days does the collar remain effective?
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