Raise$-$a$-$Ruckus's owner $($Problem $7\mathrm{.}7)$ had a bad week on Wall Street. So$,$ trying to save a few bucks, he hired an inexpensive rookie jockey to ride the horse in today's race. Meanwhile, Presidium's owner hired Raise$-$a$-$Ruckus's old experienced jockey for the day. If you knew that the rookie and the experienced jockey would contribute temporary environmental effects of $+2$ and$-3$ seconds, respectively,a$.$ Which horse would you bet on today? Explain.b$.$ Which horse would you bet on next year $($assuming Raise$-$a$-$Ruckus's owner does better in the stock market and quits scrimping on jockeys$)?$