Answer:
A and B
Step-by-step explanation:
A) Collect like terms
0=0
B) Collect like terms
0=0
A and B both correct
Answer:

Step-by-step explanation:
we know that
If the triangle of the figure is a regular polygon
then
Is an equilateral triangle
Remember that
The equilateral triangle has three equal sides and three equal interior angles
The measure of each interior angle is 60 degrees
To find the area of the equilateral triangle apply the law of sines

we have that

substitute

Answer:
x = 18
Step-by-step explanation:
We need to find the value of x.
We know that the sum of angles of a triangle is equal to 180°. So, using this property,
2x+1+3x-1+90 = 180
2x+3x = 180-90
5x = 90
x = 18
So, the value of x is equal to 18.
Answer:
-20
Step-by-step explanation:
multiply 5 and 6 then 5 and -10
30-50=-20
Isn't it 89 not 19 and if its that, its 12 and 77