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a) Graph the weight gain and loss during the pregnancy and the 20 weeks following the birth of the baby. Assume that the pregnancy lasts 40 weeks, that delivery occurs immediately after this time interval, and that the weight gain/loss before and after birth is linear.

b) Is this a continuous function? If not, then find the values of t where the function is discontinuous.

First of all, i dunno how to graph it. can anybody show me that?