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Mathematics
Problem
Let
f
(
x
)
=
x
2
f(x)=x^{2}
f
(
x
)
=
x
2
. Which of the following declarations makes
f
f
f
onto? a)
f
:
R
→
R
f:\mathbb{R}\to\mathbb{R}
f
:
R
→
R
b)
f
:
[
0
,
∞
)
→
R
f:[0,\infty)\to\mathbb{R}
f
:
[
0
,
∞
)
→
R
c)
f
:
R
→
(
0
,
∞
)
f:\mathbb{R}\to(0,\infty)
f
:
R
→
(
0
,
∞
)
d)
f
:
R
→
[
0
,
∞
)
f:\mathbb{R}\to[0,\infty)
f
:
R
→
[
0
,
∞
)
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