3.4x=2.1x+3.9 what is x

x = 3

Step-by-step explanation:

Step 1: Subtract 2.1x from both sides.

1.3x=3.9

Step 2: Divide both sides by 1.3

1.3x/1.3=3.9/1.3

x=3

Hope this helps!

Also can I have Brainliest please?

for ex: the reciprocal of 3/4 is 4/3. it is the opposite.

reciprocal definition:

a mathematical expression or function so related to another that their product is one; the quantity obtained by dividing the number one by a given quantity.

81 seats

step-by-step explanation:

if you multiply 0.65 times 125 then you get 81.5 seats. well since you can't have half of a seat you have to round down and get 81 seats in the no children zones. that leave 44 seats outside of the no children zone.