Answer:
102
Step-by-step explanation:
All angles added together=180
180-13-65
180-78
102
86 years old because you subtract 2017-1931
Answer:
c
Step-by-step explanation:
because you add up all the days then you get the total


This is a way to factoring trinomials (there exist different equivalent methods).
Multiply the trinomial but the term accompanying
. This is the second line. Then, you could take the square of the
, ant try to create a factor () () that will correspond to the expression in the second line. That is, we want 
In ? we put the corresponding numbers that, if we multiply them we will obtain 42, and if we add them we will obtain 13. This numbers are 6 and 7. Then, we have 
The last step is divide by the number that we multipy in the first step.