Please help! will give brainliest!

The first one.

Step-by-step explanation:

I believe the correct answer is the first one on the list because the variable, R, is 6 ticks below 0. How I got that was by going to 0 and counting down 6 lines and thats where R was located.

Second

Step-by-step explanation:

Because, according to the question we are searching for the opposite of R. So, a distance of 6 and marks above 0 represent the positive side, so the opposite.

(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