If 2.5 3.5 x 30 124 625
Then, x² - 1 - 2x = ?
2.5 × 1 + 1 = 3.5 3.5 × 2 + 2 = 9 9 × 3 + 3 = 30 30 × 4 + 4 = 124 124 × 5 + 5 = 625 Hence, x = 9 Hence, 9²-1 - 2× 9 = 81 - 1 - 18 = 62
Choose the grammatically correct sentence.
The trekkers carried on walking in order to get to their camp before dark.
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