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Pepperoni=P

Mushrooms=M

Sausage= S

Green Peppers=G

Onions= O

C=cheese

Note that all of these pizzas have cheese.

 

1.P+M+C=14.67

2.P+M+S+G+C=17.85

3.P+M+S+G+O+C=19.44

 

Subtract equations 2 from 3 and get Onions=$1.59.

 

Then you can't find out any more, as this is a pizza estimation problem that has too many variables and I don't eat pizza soooooo...