Simplify the rational expression. state any restrictions on the variable.

we are given

Firstly, we will factor numerators and denominators

we can see that

n^2 -6 is factor on both numerator and denominator

so, it will get cancelled

and n^2 -6 can not be equal to 0

so, one of restriction is

we can simplify it

we know that denominator can not be zero

so, option-B.......Answer

12

step-by-step explanation:

a triangle's   full angle is 180 degrees so 180 - 156 = 24. 24/2=12