Different strains of a virus survive in the air for different time periods. For a strain that survives t minutes, let N=h(t) be the number of people infected (in thousands). The most common strain survives for t0 minutes.What does the statement h(t0+15) tell you about the number of people infected?
h(t0+15) is the number of people (in thousands) infected by a strain whose open-air survival time is 15 minutes longer than the most common strain.
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