Answer
a. $52\%$
b. $52.2(\%)$
c. $52$ years or year 2024.
Work Step by Step
a. Given $p=-2.2\sqrt t+63.8$ for the percentage of jobs held by men, use the given blue curve, locate the horizontal coordinate as $t=2000$, read the corresponding vertical value to give $p\approx52\%$
b. As $t$ starts at year 1972, for year 2000, we have $t=2000−1972=28$, thus $p=-2.2\sqrt {28}+63.8\approx 52.2(\%)$
c. For $p=48\ %$, we have $-2.2\sqrt t+63.8=48$ which gives $\sqrt t\approx7.18$ and $t\approx52$ years which corresponds to $1972+52=2024$ or year 2024.
