1 Group 4
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Question 1.
Vectors
u
,
v
of lengths
|
u
|
=
3
,
|
v
|
=
4
have deviation
60
°
. Then
(
2
u
-
v
)
2
is equal to
a)
4
b)
52
c)
20
d)
28
e)
52
-
24
3
Question 2.
The midline
t
a
of the triangle
A
B
C
, where
A
=
[
5
,
2
]
,
B
=
[
-
2
,
1
]
and
C
=
[
0
,
5
]
, lies on the line
a)
x
+
6
y
-
17
=
0
b)
2
x
-
y
-
8
=
0
c)
x
-
6
y
-
7
=
0
d)
-
2
x
+
y
+
8
=
0
e)
x
+
2
y
-
9
=
0
Question 3.
The orthogonal projection of point
A
=
[
2
,
3
,
4
]
onto the straight line
X
=
[
0
,
0
,
0
]
+
t
(
1
,
1
,
1
)
,
t
∈
ℝ is
a)
[
3
,
2
,
1
]
b)
[
3
,
3
,
3
]
c)
[
2
,
2
,
2
]
d)
[
1
,
1
,
1
]
e)
[
1
,
2
,
3
]
Evaluate