Consider the model for the marriage rate.

Here x is the number of years after 1950.

(a)

Find for what years does this model indicate that the marriage rate was above 50 marriages per 1000 unmarried women.

To do this, substitute forin the equation.

Then,

Since x is the number of years after 1950.

So,

Thus, this model indicates that the marriage rate was above 50 per 1000 before