**Answer: 9 or 10**

**Step-by-step explanation:**

That is an isloated triangle.

30+[ ]+[ ]= 180 degrees.

Reminder: [ ] & [ ] is a same amount of number.

So 11*x-18 is [ ].

180-30= [ ] & [ ].

[ ] & [ ]= 150.

Then, [ ] is 150/2.

[ ]= 75.

<u>(11*x - 18)= 75 degrees.</u>

9*9-18= Answer.

I hope that helps :D

**Answer:**

**x = -16**

**Step-by-step explanation:**

-2(x +14)+1=5

**solution**

-2x - 28 + 1=5

-2x - 27 = 5

now, move the x value from left to right and constant move from right to left to solve for further

-5 - 27 = 2x

-32 = 2x

-32/2 = x

-16 = x

hence answer is x = -16

**Answer:**

According to factor theorem, if f(x) is a polynomial of degree n ≥ 1 and 'a' is any real number, then, (x-a) is a factor of f(x), if f(a)=0. ... Also, we can say, if (x-a) is a factor of polynomial f(x), then f(a) = 0. This proves the converse of the theorem.