Answer:
A. 25 km
Step-by-step explanation:
1 hour = 60 minutes
30 minutes is a half of an hour, therefore
50 / 2 = 25
Multiply
12
√
7
+
2
12
7
+
2
by
√
7
−
2
√
7
−
2
7
-
2
7
-
2
.
12
√
7
+
2
⋅
√
7
−
2
√
7
−
2
12
7
+
2
⋅
7
-
2
7
-
2
Multiply
12
√
7
+
2
12
7
+
2
and
√
7
−
2
√
7
−
2
7
-
2
7
-
2
.
12
(
√
7
−
2
)
(
√
7
+
2
)
(
√
7
−
2
)
12
(
7
-
2
)
(
7
+
2
)
(
7
-
2
)
Expand the denominator using the FOIL method.
12
(
√
7
−
2
)
√
7
2
+
√
7
⋅
−
2
+
2
√
7
−
4
12
(
7
-
2
)
7
2
+
7
⋅
-
2
+
2
7
-
4
Simplify.
12
(
√
7
−
2
)
3
12
(
7
-
2
)
3
Cancel the common factor of
12
12
and
3
3
.
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4
(
√
7
−
2
)
4
(
7
-
2
)
Apply the distributive property.
4
√
7
+
4
⋅
−
2
4
7
+
4
⋅
-
2
Multiply
4
4
by
−
2
-
2
.
4
√
7
−
8
4
7
-
8
The result can be shown in multiple forms.
Exact Form:
4
√
7
−
8
4
7
-
8
Decimal Form:
2.58300524
…
Answer:
42
Step-by-step explanation:
Answer:
c=214.28
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Step-by-step explanation:
Answer:
The vertex is ( -5,0)
Step-by-step explanation:
The vertex form of a parabola is
y = a( x-h) ^2 +k
where ( h,k) is the vertex
y=2(x+5)^2
y=2(x - -5)^2 +0
The vertex is ( -5,0)