Answer:

Step-by-step explanation:
An exponential function of the form
will decay if 
This implies that option A will not decay because 
Option B will not decay because
which implies that 
Option C can be rewritten to get:
....This exponential function decays.
Option D will not decay because 
Answer:
80
Step-by-step explanation:
The answer is C: the average reading speed of the science fiction novel.
If x is her reading speed for the historical fiction novel, and her reading speed for the sci-fi novel is just two pages more than that of the historical fiction novel, then the equation to find out how fast she reads the science fiction novel would be x + 2, as you’re adding 2 to the reading speed of the historical fiction book (x)