More people are staying single longer in the United States. The following table gives the percent of never-married adults, age 15 and over, by gender, for the years 1998 and 2018. The growth has been approximately linear.

(a) Find a linear function, m1t2, for the percent of never-married males in terms of t, the number of years since 1990.
(b) Determine the rate of change for the percent of never-married males.
(c) Find a linear function, ƒ(t), for the percent of never-married females in terms of t, the number of years since 1990.
(d) Determine the rate of change for the percent of never-married females.
(e) Use the results from parts (a) and (c) to estimate the percent of never-married males and females in 2020.

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Year 1998 2018 Males 31.2 35.2 Females 24.7 29.5