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Mathematics
Problem
If
f
′
(
x
)
>
0
f'(x)>0
f
′
(
x
)
>
0
for every
x
x
x
in an open interval
(
a
,
b
)
(a,b)
(
a
,
b
)
, which statement about
f
f
f
is most accurate on that interval? a)
f
f
f
is concave up on
(
a
,
b
)
(a,b)
(
a
,
b
)
. b)
f
f
f
is decreasing on
(
a
,
b
)
(a,b)
(
a
,
b
)
. c)
f
f
f
is increasing on
(
a
,
b
)
(a,b)
(
a
,
b
)
. d)
f
f
f
has constant average rate of change on
(
a
,
b
)
(a,b)
(
a
,
b
)
.
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