Since both terms are perfect cubes, factor using the difference of cubes 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
2
a
=
x
2
and
b
=
y
b
=
y
.
(
x
2
−
y
)
(
(
x
2
)
2
+
x
2
y
+
y
2
)
(
x
2
-
y
)
(
(
x
2
)
2
+
x
2
y
+
y
2
)
Multiply the exponents in
(
x
2
)
2
(
x
2
)
2
.
Answer:
C
Step-by-step explanation:
You can estimate the value of a square root that is not a perfect square by looking at the perfect squares that are larger and smaller. For instance, for sqrt(52), we know that the perfect square of 49 is 7 and that 64 is 8. So we know that 52 is between those two and closer to 7. So you can make a reasonable estimation using those facts.
60%*m=48
60%=0.6
0.6-:48=80
60%*80=48
48 is 60% of 80
