Answer:
1. 20(-1) - (-4) (-5)= -40
2.[-12 + (-3 - 3)]= -18
Explanation:
20(-1) - (-4) (-5)
=(20 * -1) - (-4 * -5)
(When 2 numbers are written next to each other in brackets without any sign in between them, it means multiplication)
=(-20) - (20)
= -20 -20
= -40
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[-12 + (-3 - 3)]
=[-12+(-6)]
=[-12-6]
= -18