100,000 people are currently sick with disease. If that disease spreads at rate of 50% per week, how many weeks will it be until 1,000,000 people are infected?

If you mean it speads at the amount of 100,000 it would be only 10 weeks before 1,000,000 people are effected

or  If you mean 50% percent of 100,000 which is 50,000 it would take a total of 20 weeks before 1,000,000 people are infected

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the answer is d. (1.2, -4.7) on edgn

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