From 1890 through 1990, the number of men M and women W in the US labor force can be modeled by the following equations, where t is the number of years since 1890. M=0.0016t^2 + 0.315t + 19.467 W= 0.007t^2 - 0.228t + 5.908 Find a model for the total number of people in the US Labor force.