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To find out the total cost of a large pizza with 3 toppings, we need to plug in the value of x (which represents the number of additional toppings) into the equation y = 11 + 1.5x.
Here, x = 3 (since there are 3 toppings).
Now we calculate the total cost (y):
y = 11 + 1.5(3)
y = 11 + 4.5
y = 15.5
The total cost of the pizza with 3 toppings is $15.50.