Question

please tell me how to solve

Answer 1

30×{15+(-3)}
30×(15-3)
30×12
360


-31 = -30+(-1)
-31=-30-1
-31=-31


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Answer 2

$\textbf{ANSWER:}$

$1. \: 30 \times (15 + ( - 3) ) \\ = > 30 \times (1 5 - 3) \\ = > 30 \times 12\\ = > 360$

$2.(-30) +(- 1) \\ = > (- 30)-1 \\ => (-31)$