In Activity 5.3.1(c) , I'm not sure " $y=P(t)$ is the same as $t=L(y)$" is clear. Maybe we mean that $y=P(t)$ and $t=L(y)$ represent the same relationship between $t$ and $y$?
In Remark 5.3.4 , I think moving the restrictions on $b$ into a parenthetical (above or below) would make the displayed equivalence easier to read.
Activity 5.3.7 The comma in the introduction is extraneous
In Remark 5.3.10 Maybe an aside xref'ing the definition of $e$ back in 5.1? Also, is this the first use of "natural logarithm"? If so, maybe it deserves a <term>.
<term>.