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410 ?
Explanation : 4 comes from what you subtract and 10 comes from what the question would be if it was added
Answer:
C
Step-by-step explanation:
According to SohCahToa, cosine is adjacent over the hypotenuse.
The adjacent when looking from angle b, is 21.
The hypotenuse of this triangle is 29.
So Cos B=21/29
I think it is -2, if that helps