Evaluate the following expressions.
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Answer with full explanation ----
1. (-4)³
= -4 × -4 × -4
= -64
2. (-7)²
= -7 × - 7
= 49
3. [1 + (16 + 4 ) ÷ 4 ] × 8
= [ 1 + ( 20) ÷ 4 ] × 8
= [ 1 + 5 ] × 8
= 6 × 8
= 48
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