Which of these functions are concave
up
on the interval
(
0
,
∞
)
\displaystyle {\left({0},\infty\right)}
(
0
,
∞
)
? (Select all that are.)
y
=
ln
(
x
)
\displaystyle {y}={\ln{{\left({x}\right)}}}
y
=
ln
(
x
)
y
=
1
x
\displaystyle {y}={\frac{{{1}}}{{{x}}}}
y
=
x
1
y
=
x
\displaystyle {y}=\sqrt{{{x}}}
y
=
x
y
=
x
3
\displaystyle {y}={\sqrt[{{3}}]{{{x}}}}
y
=
3
x
y
=
e
x
\displaystyle {y}={e}^{{x}}
y
=
e
x
y
=
x
3
\displaystyle {y}={x}^{{3}}
y
=
x
3
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