I figured out the answers to these Alteryx Questions, just want to verify if I am correct with a possible explaination? Thanks.

Why is a parse error received when multiplying Price by Quantity? Why is a parse error received when multiplying Price by Quartity? Dataset: Contiouration: Fommatis - Cortauratio Error: A. The field Cuantiy is a string data type. B. The field Total Cost is a V_Wstring data trpe. C. The field Price is a string data type. D. The field Total Cost is too amall. A workflow has 2 separate datasets where many records in the first dataset are present in the second dataset. Which single tool will accept and examine both datasets and isolate records in the first dataset that are not present in the second dataset? A. Filter B. Join C. Union D. Unique