The drug penicillin was discovered by observation of mold growing on biology lab dishes. suppose a mold begins growing on a lab dish. when first observed, the mold covers 7 cm^2 of the dish surface, but it appears to double every day.
f. i. if the area of a mold patch is first measured to be 5 cm^2 and the area doubles each day, how long will it take that mold sample to grow to an are of 40 cm^2
f. ii. for how many days will the mold patch part i have an area less than 330 cm ^2