Answer :
The community will contain 15,000 people with the gene that causes a triangle on their forehead after 20 days.
The rate of change of n (t) with respect to time is 500 people per day. This means that the equation for n (t) is given by:
n (t) = 5,000 + 500t
where t is the number of days since time t. At time t, n (t) = 5,000, and as time passes, the number of people with the gene that causes a triangle on their forehead increases. After 20 days, n (t) = 5,000 +500*20 = 15,000, meaning that after 20 days, the community will contain 15,000 people with the gene that causes a triangle on their forehead.
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