A triangle's angles will always equal up to 180. Since you already have to of the angles, you will add them up together. 30+20=50. Then, you take 180 and subtract it by the sum of the two previous angles. 180-50=130. Now you know the last angle is 130. You also know that the missing angle is also 130. The reason for that is because the two angles are the exact same if you look at it.
so what you do is
a^2-a-20
see, the number in front of the a^2 is 1, so now we do
look at the number infront of the a and the number at the end
-1 and -20
whhat 2 numbers multiply to get -20 and add to get -1
trial and error
-20+1=-19, nope
-10+2=-8 nope
-5+4=-1, yes
(a-5)(a+4) is factored
Answer:
8 + X
Step-by-step explanation:
![\frac{x}{9} =3](https://tex.z-dn.net/?f=%5Cfrac%7Bx%7D%7B9%7D%20%3D3)
The quotient(division) of a number(x) and 9 is(equals) 3
[x represents the unknown number]
Your answer is the 4th option