Answer:
234.3
Explanation:
You use Law of Cosines:
a^2 = b^2 + c^2 - 2bc(cosA)
Plug in the values
a^2 = 400^2 + 375^2 - 2(400*375)(cos35)
a = sqrt(160000+140625-300000(cos35))
a = sqrt(300625 - 300000cos(35))
a is approx. 234.263498466, which rounds to 234.3