Can someone double check this? I got 12 as my answer​

12

Step-by-step explanation:

(6x - 9) + (6x - 24) + (81 - x) = 180

11x + 48 = 180

11x = 132

x = 12

69°

Step-by-step explanation:

All angles in a triangle must add to 180°:

(5x+9)+(4x+15)+(x+36)=180

10x+60=180

10x=120

x=12°

The problem asks for the measure of angle C:

C=(81-x)°=69°

You were on the right track because you got the value of x correct. You just didn't answer the problem correctly.

good luck!

cutie~

(2x + 16) + (x) = 180

step-by-step explanation:

given,

abcd is a quadrilateral inscribed in a circle

angle a is labeled x plus 16, (x + 16)

angle b is labeled x degrees, (x)

angle c is labeled 6x minus 4, (6x – 4)

angle d is labeled 2x plus 16, (2x + 16)

what equation can be used to solve for angle b?

we know that the sum of the opposite angles of a simple quadrilateral inscribed in a circle is 180 degrees.

angle b is opposite angle d

therefore, angle b + angle d = 180

(x) + (2x + 16) = 180 

same as (2x + 16) + (x) = 180