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

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The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?

Lucinda leaves money in her savings account for 8 years. she started with $800 and earned 3.5% interest compound annually. how much money is in her account?