According to demographers, zero population growth occurs during the process of demographic transition when

a.)the crude birth and death rates are simultaneously low.
b.)the crude birth and death rates begin to increase rapidly.
c.)the crude death rate is higher than the crude birthrate.
d.)the total fertility rate falls below the crude birthrate.
e.)the total fertility rate rises above the crude death rate.

The answer is    (d) 7/2======we have    we also  have an integral      notice how function f splits up at x = 0. there's a left piece and a right pieceso we'll need to do the same thing with our integral: split it at x = 0we use a property of integrals that allows us to split up and sum:     notice that for the piecewise function f, the function has the equationf(x) = x when x  ≤ 0. so for the integral  , f(x) = x so it changes into      for the piecewise function f, the function has the equationf(x) = x+1  when x  > 0. for the integral  , we have    therefore, back to our splitted integral: