Answer:
In a triangle, sum of three angles=180°
So, A+B+C=180
C=180-A-B
C=180-60-a-60+a
C=60°
Hope it helps :-)
Answer:
B. 10
Step-by-step explanation:
These are vertical angles meaning they are also equal.

So... first off, we sort the dividend, the numerator, in descending order... so, looking at the exponents in this one, is already sorted in descending order, from 4 down to 1, so that's done.
then the divisor, we have x+3, that means x + 3 = 0, x = -3,
so, we'll be using -3 for the synthetic division then.

and now, we'll use those coefficients, dropping the exponents of the polynomial by one, and the remainder, remains as a fraction with the divisior of x+3.
Your answer would be -16.