Final answer:
To evaluate the function g(r) = 25 - 3r, substitute the given value of r into the function and calculate the result.
Step-by-step explanation:
The function g(r) = 25 - 3r is a linear function.
To evaluate the function, substitute the given value of r into the function and calculate the result.
For example, if r = 10:
g(10) = 25 - 3(10) = 25 - 30 = -5
So, g(10) = -5.