From 2000 to 2020, a world health organization collected data on the percentage
of a country's population that had access to safe drinking water. The function
W(t) = 0.5t +47 models the percentage of the population in Guatemala that has
safe drinking water where t is the number of years since 2000 and W is the
percentage of the population that has access.
Explain why the values of t should have a constraint.
5.