Answer are in order from top to bottom
1. 8
2. square of 7
3. 1/2
4. 20
First of all, let's recall that the full circumference is

Now, since 30 is one twelfth of 360, a 30° arc will be one twelfth of the whole circumference. So, if you call the arc length A, you have

Since we know the arc length, we can build and solve the following equation:

(B) because 1 litter is equal to .1 dekaliter
Answer:
x = 7/3
Step-by-step explanation:
3(x-4)=-5
Distribute
3x - 12 = -5
Add 12 to each side
3x -12+12 = -5+12
3x = 7
Divide by 3
3x/3 = 7/3
x = 7/3