Final answer:
The cost of the trip for n people can be represented by the algebraic expression $800 + $11n. Evaluating this expression for 39 people gives a total cost of $1229.
Step-by-step explanation:
In order to calculate the cost of the trip for n people, we need to consider the cost of renting the bus and the cost of the museum tickets. The cost of renting the bus is a fixed amount of $800. The cost of the museum tickets is $11 per person. Therefore, the algebraic expression that represents the cost of the trip for n people is:
$800 + $11n
To evaluate this expression for 39 people, we substitute n with 39:
$800 + $11 imes 39 = $800 + $429 = $1229