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Mathematics: Post your doubts here!

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Hi guys, can anybody please tell me how to find an angle using the cosine rule? I know the formula is a squared= b squared + c squared - 2bc cos A but it can only be used to find the side, not the angle??????
 
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can someone explain how to find a matrix representing a transformation, pleaaaaaassee
I dont want to memorize them, cause they're they wanna know how did u get it.. so please anyone? :(
 
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help PLEASE!\

Beatrrice pays yearly rent of 10,800,

tax of 6000 and

bills of x

after she has paid all 3 she is left with 12,000

calculate how much she spends on bills??
 
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