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Math Problems
Grade 8
Understanding negative exponents
[
−
3
(
2
j
−
5
k
)
2
]
2
[-3(2j-5k)^2]^2
[
−
3
(
2
j
−
5
k
)
2
]
2
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[
−
3
(
2
j
−
5
k
2
)
]
2
[-3(2j-5k^2)]^2
[
−
3
(
2
j
−
5
k
2
)
]
2
Get tutor help
(
1
2
)
−
2
+
3
0
(\frac{1}{2})^{-2} + 3^{0}
(
2
1
)
−
2
+
3
0
Get tutor help
P
(
t
)
=
30
(
2
)
(
t
18
)
P(t)=30(2)^{\left(\frac{t}{18}\right)}
P
(
t
)
=
30
(
2
)
(
18
t
)
\newline
The function models
P
P
P
, the amount of bacteria, in colony-forming units, in a bacteria culture after
t
t
t
minutes of growth. How many colony-forming units of bacteria are in the bacteria culture after
90
90
90
minutes?
\newline
Choose
1
1
1
answer:
\newline
(A)
3
×
1
0
2
3\times10^{2}
3
×
1
0
2
\newline
(B)
9.6
×
1
0
2
9.6 \times10^{2}
9.6
×
1
0
2
\newline
(C)
5.4
×
1
0
3
5.4 \times10^{3}
5.4
×
1
0
3
\newline
(D)
2.43
×
1
0
7
2.43 \times10^{7}
2.43
×
1
0
7
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