What was the structure pictured above used for? to cross rivers on trade routes to deliver water from the hills into the cities to transport soldiers in the roman legions for public gladiator combat and chariot races

step-by-step explanation:

we are given

since, we have to isolate x on anyone side

so, we can move all x terms on one side

subtract both sides by 2x

add both sides by 9

divide both sides by 4

we get

b.-4 units

all you   do is count how many times you move

10 down (bang1)

5 up

5down (2)

2.5 up

2.5 down (3)

1.25 up

1.25 down (4)

now add them up : )

hoped i lol