During a recession, Congress decides to stimulate the economy by providing funds to hire unemployed workers for government projects. Suppose thattmonths after the stimulus program begins, there areN(t) thousand people unemployed, where N(t) = -t³+ 39t²+ 402t+ 3041 To avoid overstimulating the economy (and inducing inflation), a decision is madestimulus program as soon as the rate of unemployment begins to decline. When does this occur? At this time, how many people are unemployed?