Since both terms are perfect cubes, factor using the difference of cubes formula, formula,
a
3
−
b
3
=
(
a
−
b
)
(
a
2
+
a
b
+
b
2
)
a
3
-
b
3
=
(
a
-
b
)
(
a
2
+
a
b
+
b
2
)
where
a
=
x
a
=
x
and
b
=
7
b
=
7
.
(
x
−
7
)
(
x
2
+
7
x
+
49
)
Answer:
1
Step-by-step explanation:
eeeeeeeeeeeeeeeeeeeee
Write an exponential function that models the decay of this material.
The function is described by the half-life equation which is expressed as:
An = Ao e^-kt where An is the amount left after t time, Ao is the initial amount and k is a constant.
Find how much radioactive material remains after 18 hours. Round your answer to the nearest thousandth.
1/2Ao = Ao e^-k(78)
k = 8.89 x 10^-3
An = 790e^-8.89 x 10^-3(18)
An = 673.22 kg
Answer:
375
Step-by-step explanation:
m= d * v
d= 3
v= 5 * 5 * 5= 125
125 * 3 = 375
