Answer: $61.06
Explanation:
Let the price of sundress be 'x' .
Given : Sydney has a $75 mall gift card.
She wants to buy a sundress and a movie ticket.
The movie ticket with tax costs = $11.50.
The sales tax percentage on sundress = 4%=0.04
Then , the total cost of sundress including the tax will be :-

Since, the limit of purchase is $75, so we have the following equation:-

Hence, the price of ticket = $61.06