Why did the West African kingdoms profit from the trans-Saharan trade? They served as trading centers for merchants on the way to gold mines.
They used their access to the coast to ship goods all over the world.
They strengthened their militaries by enlisting Islamic soldiers.
They used the trade routes to conquer Islamic kingdoms.

(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

b. 2 and 4

step-by-step explanation: