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Solutions
Activities 1
1.1)
a)
x
=
2
b)
x
=
3
c)
x
=
2
3
d)
x
=
5
e)
x
=
5
3
f)
x
=
1
2
g)
x
=
0
h)
x
=
9
i)
x
=
8
8
j)
x
=
0
k)
x
=
8
l)
x
=
4
a)
x
=
2
b)
x
=
3
c)
x
=
2
3
d)
x
=
5
e)
x
=
5
3
f)
x
=
1
2
g)
x
=
0
h)
x
=
9
i)
x
=
8
8
j)
x
=
0
k)
x
=
8
l)
x
=
4
1.2)
a)
x
=
1
b)
x
=
3
c)
x
=
1
6
d)
x
=
1
6
e)
x
=
1
8
f)
x
=
−
2
g)
x
=
3
h)
x
=
1
1
i)
x
=
2
3
a)
x
=
1
b)
x
=
3
c)
x
=
1
6
d)
x
=
1
6
e)
x
=
1
8
f)
x
=
−
2
g)
x
=
3
h)
x
=
1
1
i)
x
=
2
3
Activities 2
2.1)
a)
x
=
1
b)
x
=
2
c)
x
=
−
9
d)
x
=
2
e)
x
=
1
1
5
f)
x
=
0
g)
x
=
−
3
h)
x
=
−
1
i)
x
=
1
a)
x
=
1
b)
x
=
2
c)
x
=
−
9
d)
x
=
2
e)
x
=
1
1
5
f)
x
=
0
g)
x
=
−
3
h)
x
=
−
1
i)
x
=
1
2.2)
a)
x
=
1
b)
x
=
5
6
c)
x
=
1
0
8
=
5
4
d)
x
=
−
4
e)
x
=
−
2
f)
x
=
9
a)
x
=
1
b)
x
=
5
6
c)
x
=
1
0
8
=
5
4
d)
x
=
−
4
e)
x
=
−
2
f)
x
=
9
Activities 3
3.1)
a)
x
=
6
b)
x
=
4
c)
x
=
4
0
d)
x
=
1
2
e)
x
=
1
4
f)
x
=
9
g)
x
=
2
0
h)
x
=
1
2
i)
x
=
0
a)
x
=
6
b)
x
=
4
c)
x
=
4
0
d)
x
=
1
2
e)
x
=
1
4
f)
x
=
9
g)
x
=
2
0
h)
x
=
1
2
i)
x
=
0
3.2)
a)
x
=
2
7
b)
x
=
3
0
c)
x
=
4
d)
x
=
−
4
e)
x
=
8
f)
x
=
0
a)
x
=
2
7
b)
x
=
3
0
c)
x
=
4
d)
x
=
−
4
e)
x
=
8
f)
x
=
0
Activities 4
4.1)
a)
x
=
−
7
3
b)
x
=
−
1
8
7
c)
x
=
0
d)
x
=
7
1
2
e)
x
=
1
0
f)
x
=
−
1
1
g)
x
=
−
3
1
5
h)
x
=
1
3
2
i)
x
=
3
j)
x
=
8
1
1
a)
x
=
−
7
3
b)
x
=
−
1
8
7
c)
x
=
0
d)
x
=
7
1
2
e)
x
=
1
0
f)
x
=
−
1
1
g)
x
=
−
3
1
5
h)
x
=
1
3
2
i)
x
=
3
j)
x
=
8
1
1
4.2)
a)
x
=
5
b)
x
=
3
1
3
c)
x
=
−
1
5
d)
x
=
1
e)
x
=
−
4
f)
x
=
5
2
a)
x
=
5
b)
x
=
3
1
3
c)
x
=
−
1
5
d)
x
=
1
e)
x
=
−
4
f)
x
=
5
2
Activities 5
5.1)
a)
x
=
−
5
7
b)
x
=
−
7
9
c)
x
=
6
6
5
1
7
d)
x
=
8
7
1
6
e)
x
=
4
0
0
2
9
f)
x
=
1
6
4
8
3
a)
x
=
−
5
7
b)
x
=
−
7
9
c)
x
=
6
6
5
1
7
d)
x
=
8
7
1
6
e)
x
=
4
0
0
2
9
f)
x
=
1
6
4
8
3
5.2)
a)
x
=
2
b)
x
=
4
c)
x
=
2
d)
x
=
−
1
1
0
e)
x
=
6
f)
x
=
4
g)
x
=
−
2
7
5
h)
x
=
−
9
a)
x
=
2
b)
x
=
4
c)
x
=
2
d)
x
=
−
1
1
0
e)
x
=
6
f)
x
=
4
g)
x
=
−
2
7
5
h)
x
=
−
9
Activities 6
6.1)
a)
x
=
1
2
b)
x
=
1
5
c)
x
=
1
8
d)
x
=
−
3
2
e)
x
=
1
3
f)
x
=
1
2
a)
x
=
1
2
b)
x
=
1
5
c)
x
=
1
8
d)
x
=
−
3
2
e)
x
=
1
3
f)
x
=
1
2
6.2)
a)
x
=
2
b)
x
=
1
2
c)
x
=
3
d)
x
=
1
6
e)
x
=
1
7
f)
x
=
1
5
a)
x
=
2
b)
x
=
1
2
c)
x
=
3
d)
x
=
1
6
e)
x
=
1
7
f)
x
=
1
5
Activities 7
7.1)
a)
x
=
1
6
b)
x
=
−
2
c)
x
=
−
4
.
4
d)
x
=
6
.
4
e)
x
=
3
f)
x
=
−
5
g)
x
=
−
4
3
h)
x
=
5
2
i)
x
=
−
8
j)
x
=
9
4
k)
x
=
1
l)
x
=
−
3
m)
x
=
−
1
n)
x
=
2
9
3
2
o)
x
=
1
3
a)
x
=
1
6
b)
x
=
−
2
c)
x
=
−
4
.
4
d)
x
=
6
.
4
e)
x
=
3
f)
x
=
−
5
g)
x
=
−
4
3
h)
x
=
5
2
i)
x
=
−
8
j)
x
=
9
4
k)
x
=
1
l)
x
=
−
3
m)
x
=
−
1
n)
x
=
2
9
3
2
o)
x
=
1
3
7.2)
a)
x
=
−
1
4
b)
x
=
1
c)
x
=
1
d)
x
=
1
0
3
e)
x
=
2
f)
x
=
6
3
1
6
g)
x
=
5
2
h)
x
=
2
4
i)
x
=
0
a)
x
=
−
1
4
b)
x
=
1
c)
x
=
1
d)
x
=
1
0
3
e)
x
=
2
f)
x
=
6
3
1
6
g)
x
=
5
2
h)
x
=
2
4
i)
x
=
0
7.3)
a)
x
=
1
0
3
b)
x
=
3
2
c)
x
=
3
d)
x
=
1
3
e)
x
=
2
6
1
9
f)
x
=
1
3
g)
x
=
1
7
h)
x
=
3
a)
x
=
1
0
3
b)
x
=
3
2
c)
x
=
3
d)
x
=
1
3
e)
x
=
2
6
1
9
f)
x
=
1
3
g)
x
=
1
7
h)
x
=
3
7.4)
a)
x
=
−
9
2
b)
x
=
8
4
1
8
7
c)
x
=
8
1
1
d)
x
=
−
1
1
2
e)
x
=
2
4
f)
x
=
2
0
7
g)
x
=
−
3
0
h)
x
=
6
5
2
a)
x
=
−
9
2
b)
x
=
8
4
1
8
7
c)
x
=
8
1
1
d)
x
=
−
1
1
2
e)
x
=
2
4
f)
x
=
2
0
7
g)
x
=
−
3
0
h)
x
=
6
5
2
7.5)
a)
x
=
−
9
2
b)
x
=
8
4
1
8
7
c)
x
=
8
1
1
d)
x
=
−
1
1
2
e)
x
=
2
4
f)
x
=
2
0
7
g)
x
=
−
3
0
h)
x
=
6
5
2
a)
x
=
−
9
2
b)
x
=
8
4
1
8
7
c)
x
=
8
1
1
d)
x
=
−
1
1
2
e)
x
=
2
4
f)
x
=
2
0
7
g)
x
=
−
3
0
h)
x
=
6
5
2
7.6)
a)
x
=
3
5
2
b)
x
=
1
3
c)
x
=
2
6
3
d)
x
=
1
1
3
e)
x
=
1
4
9
f)
x
=
−
1
1
3
9
a)
x
=
3
5
2
b)
x
=
1
3
c)
x
=
2
6
3
d)
x
=
1
1
3
e)
x
=
1
4
9
f)
x
=
−
1
1
3
9
Activities 8
8.1)
a)
x
=
±
7
b)
x
=
±
3
c)
x
=
±
2
d)
x
=
±
5
e)
x
=
±
2
.
5
f)
no solution
a)
x
=
±
7
b)
x
=
±
3
c)
x
=
±
2
d)
x
=
±
5
e)
x
=
±
2
.
5
f)
no solution
8.2)
a)
no solution
b)
x
=
±
3
c)
x
=
±
5
d)
x
=
±
5
e)
x
=
±
8
f)
x
=
±
9
g)
x
=
±
4
h)
x
=
±
2
i)
x
=
±
3
a)
no solution
b)
x
=
±
3
c)
x
=
±
5
d)
x
=
±
5
e)
x
=
±
8
f)
x
=
±
9
g)
x
=
±
4
h)
x
=
±
2
i)
x
=
±
3
Activities 9
9.1)
a)
(
5
,
4
)
b)
(
4
,
1
)
c)
(
2
,
3
)
d)
(
0
,
4
)
a)
(
5
,
4
)
b)
(
4
,
1
)
c)
(
2
,
3
)
d)
(
0
,
4
)
9.2)
a)
(
5
,
4
)
b)
(
6
,
−
2
)
c)
(
1
0
,
6
)
d)
(
3
,
9
)
a)
(
5
,
4
)
b)
(
6
,
−
2
)
c)
(
1
0
,
6
)
d)
(
3
,
9
)
9.3)
a)
(
8
,
5
)
b)
(
3
,
2
)
c)
(
5
,
4
)
d)
(
1
,
5
)
a)
(
8
,
5
)
b)
(
3
,
2
)
c)
(
5
,
4
)
d)
(
1
,
5
)
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