A student combined like terms to create the expression 15x + 39. What could the original expression have been? Choose all that apply.
A. (5x + 5x + x) + 39 + 5x
B. 5x + 13 + 5x + 26 + 5x
c. 3(5x + 39)
D. 3(5x + 13)
E. (3 · 5) + x + 39

b

step-by-step explanation:

b

(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