Answer:
X = 80°
Step-by-step explanation:
55+45=100
180-100=80 angles in a triangle=180°
So Y = 80
and Y=X because opposite angles around a point are equal
Answer:
B
Step-by-step explanation:
the sum of the roots = - 
x² + 6x - 55 = 0
with a = 1 , b = 6 , then
sum of roots = - 
= - 6
X + 3y - 2z = 1
-x - 4y + 6z = 2
-------------------add
-y + 4z = 3
x + 3y - 2z = 1....multiply by -2
2x - y + 2z = 1
------------------
-2x - 6y + 4z = -2 (result of multiplying by -2)
2x - y + 2z = 1
-----------------add
-7y + 6z = -1
-y + 4z = 3 .....multiply by -7
-7y + 6z = -1
-----------------
7y - 28z = -21 (result of multiplying by -7)
-7y + 6z = -1
-----------------add
- 22z = -22
z = -22/-22
z = 1 <===
-y + 4z = 3
-y + 4(1) = 3
-y + 4 = 3
-y = 3 - 4
-y = -1
y = 1 <===
x + 3y - 2z = 1
x + 3(1) - 2(1) = 1
x + 3 - 2 = 1
x + 1 = 1
x = 1 - 1
x = 0 <==
so x = 0, y = 1, and z = 1
Answer:
They will expect the ratio below:
x/20 = 160/8, with x: population
Then
x = 20x160/8 = 400
4a) -5;
-4x+5=25
-4x=20
X=-5
4b) No;
-4(0)+5=5
4c) Yes;
-4(-7)+5=33
