A because that is where they cross
I don't understand sorry but I speak another language English
Answer:

Step-by-step explanation:
Just factored out the 10.
CosA=(21^2+23^2-25^2)/2*21*23
cosA=345/966
A=cos^-1(345/966)
A=69.08
1. 700 calories
2. Half a serving
3.x=serving
350x=calories