Your grammar is wrong. You aren't asking a question. I don't want to be mean but yeah you need to ask a real question.
Answer:
cosA = 
Step-by-step explanation:
cosA =
=
= 
Answer:
the correct answer should be f-52=63
Step-by-step explanation:
Answer:
2870
Step-by-step explanation: mind
In case the user wants to see workings. These problems can easily be solved on a calculator, but can we work them out in our heads? ;)
9.34-3.029
=9.340-3.029
=9.340-3.000-0.029
=6.340-0.029
=6.311