Answer:
$6
Step-by-step explanation:
the fixed cost = $13
the variable cost is unknown. It depends on the rounds played. according to the question the additional rounds played is 5 (6 - 1) .Represent the variable cost with x
the next equation can be formed using variables from the question :
$43 = $13 + 5x
collect like terms
$43 - $13 = 5x
$30 = 5x
divide both sides of the equation by 5
x = $6