Number 10:
All angles in a triangle =180 degrees
so add the first to and subtract that by 180
166 degrees
180-166=14
so x=14 degrees
I'm assuming this is multiple choice and you forgot to post the answers. I'll take a guess and say it probably looks something like this:

Because you can't take the square root of a negative number without getting an imaginary result, resulting in the function having a closed domain limit.
Answer:
15 litres
Step-by-step explanation:
1/3 x= 5
x= 5 : 1/3
x= 5*3
x= 15 litres
9514 1404 393
Answer:
1. (x -3)(x -1)
2. (x -4)(x +1)
Step-by-step explanation:
1. The long division is shown in the first attachment. The quotient is (x -3), so the factorization is ...
x^2 -4x +3 = (x -1)(x -3)
__
2. The long division is shown in the second attachment. The quotient is (x -4), so the factorization is ...
x^2 -3x -4 = (x +1)(x -4)