Question

Help with 7 and 8 and explain

Answer 1

7.
`44^(\circ)`

8.

Explanation:

7. Using Cosine Rule

`a^2=c^2 +c^2+bcCos(a)`

=>
`a^2=20^2+15^2-2*20*15Cos(68^o)`

`a^2=400.24`

`a=20.00`

=>Using Sine Rule

`20/Sin 68^o=15/sinB`

`ABC=44^o`

8