Question

The linear function
f
(
x
)
represents the percentage of a phone battery's charge remaining after
x
hours of use.

Which statement explains the meaning of
f
(
10
)
=
25
?
A.
After
10
hours, the phone has a charge of
0
%
.

B.
After
25
hours, the phone has a charge of
0
%
.

C.
After
10
hours, the phone has a charge of
25
%
.

D.
After
25
hours, the phone has a charge of
10
%
.

Answer 1

C. After 10 hours, the phone has a charge of 25%.

(f(x) gives percent remaining after x hours, so plugging x = 10 yields 25% remaining.)