Question

Please answer this question now

Answer 1

`\boxed{u = 6.0}`

Explanation:

Using the cosine rule

`c^2= a^2+b^2-2abCosC`

Here c = u , a = 11 , b = 12 and C = 30

`u^2 = 11^2+12^2-2(11)(12)\ Cos 30\\u^2 = 121+144-2(132)(0.866)\\u^2 = 265-228.6\\u^2 = 36.37`

Taking sqrt on both sides

u = 6.0 (To nearest tenth)