# Model with composite functions

### Problem

Rafael has a solar-powered video game console. He identified a few relevant functional relationships and modeled them as shown below:
FunctionInputOutput
DThe time of year, xHours of daylight, D, left parenthesis, x, right parenthesis
EHours of daylight, kAmount of solar energy gained over the day, E, left parenthesis, k, right parenthesis
GAmount of solar energy, rHours of video games Rafael can play, G, left parenthesis, r, right parenthesis
The expression G, left parenthesis, E, left parenthesis, k, right parenthesis, right parenthesis represents which of the following?