# what would be the world population if the growth rate were reduced to 1.9%/yr

**Question description**

The world population at the beginning of 1990 was 5.3 billion. Assume that the population continues to grow at the rate of approximately 2%/year and find the function *Q*(*t*) that expresses the world population (in billions) as a function of time *t* (in years), with *t* = 0 corresponding to the beginning of 1990. (Round your answers to two decimal places.)

(a) If the world population continues to grow at approximately 2%/year, find the length of time *t*_{0} required for the population to quadruple in size.*t*_{0} = 70

(b) Using the time *t*_{0} found in part (a), what would be the world population if the growth rate were reduced to 1.9%/yr?

ANSWER NEEDED billion people

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