Decimal answers:
1. 0.3
2. -0.25
3. 0.25
4. -0.75
5. -0.35
6. -1.75
7. -0.09
8. -0.52
9. -1.73
10. 0.43
fraction answers:
1. 3/10
2. -1/4
3. 1/4
4. -3/4
5. -7/20
6. -1 3/4
7. -9/100
8. -13/25
9. -1 73/100
10. -43/100
O to the power of 2 i think

now, if we a "prime factoring" of each number, we get
204 =
2*2*3*17
120 = 2*
2*2*3*5
168 = 2*
2*2*3*7
now, notice the GCD for all three is that common bolded values, namely 2*2*3, or 12, so each room will house 12 participants,
now, how many rooms for all German? 204 ÷ 12, or 17 rooms.
how many rooms for all English ones? 120 ÷ 12, or 10 rooms.
how many rooms for the French ones? 168 ÷ 12, or 14 rooms.
so the total amount of rooms for all of them is
17 + 10 + 14.
Square root (8-0)^2 + (8+7)^2
square root 64+15^2
=8+15
= 23