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Gilbert is training for a bike race. As part of his training, he does practice rides on portions of the actual race course. Gilbert's first practice ride covers 5 miles of the course, and his second practice ride covers 9 miles of the course. Between these practice rides, he increases his average speed by 2 miles/hour.

These functions model the time it took Gilbert to do each practice ride, where [tex]$x$[/tex] is his speed during the first practice ride.

[tex]\[
\begin{array}{|c|c|}
\hline \text{Practice Ride 1} & \text{Practice Ride 2} \\
\hline a(x)=\frac{5}{x} & b(x)=\frac{9}{x+2} \\
\hline
\end{array}
\][/tex]

The denominator of the function that models practice ride 2 represents the [tex]$\square$[/tex].

To find a function that models the total amount of time Gilbert spent doing practice rides on the race course, [tex]$\square$[/tex] the functions.



Answer :

GinnyAnswer
1. The denominator of the function that models practice ride 2 represents the speed during the second ride.

2. To find a function that models the total amount of time Gilbert spent doing practice rides on the race course, add the functions.

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