THIS IS A LITTLE HARD BUT FILL IN THESE BLANKS FOR ME 40 POINTS

Why do pregnant women come from russia to be birth tourists? give an explanatory response.

Commercial agriculture consists of raising food for trade and profit, while subsistence agriculture focuses on -- a. providing the basic needs of the farmer's family b. providing the basic needs of the neighboring communities c. creating more arable land for future use d. obtaining subsidies from governments and corporations

What does the delta symbol represents in this equation