Помогите решить 1,2,3,4,5

Question

Помогите решить 1,2,3,4,5

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Answer 1

1) A + B = 3 + 5 = 8
2) b = -7    -(-b) = -(- -7) = -7
3) |8.31| = 8.31
    |-2.25| = -2.25
8.31 - 2.25 = 7.06
4) -5.28
5) -8 + (-7) = -15C