Let x=balloon swords
let x+4=balloon dogs (four more than x is x+4)
let x+7=balloon hats (three more than x+4 is x+7)
the answer is x+7
I don't know how to correctly explain the second answer (although I do know that it is 1)
Answer:

Step-by-step explanation:
Given


Required
Find g(3)
Since g(x) is a linear function, then:

For: 





For: 




Substitute 



So, the function is:


Calculate g(3)



This question is missing information. Post the entire question.
It is not reasonable because if someone were to add 4 toppings, the price would be $20.41. However, if a person were to add 3 toppings using that equation, the price would $19.02.