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Mathematics
Mathematics
Problem
A chemical is added to a solution at a rate of
r
(
t
)
=
4
t
r(t)=4t
r
(
t
)
=
4
t
milligrams per minute. If
30
30
30
milligrams have been added between
t
=
a
t=a
t
=
a
and
t
=
5
t=5
t
=
5
minutes (
a
<
5
a<5
a
<
5
), what is the value of
a
a
a
? a)
5
−
15
5-\sqrt{15}
5
−
15
b)
10
\sqrt{10}
10
c)
2
5
2\sqrt{5}
2
5
d)
5
\sqrt{5}
5
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