It is (8.49 × 10) − 7 = 77.9
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It is 849.
No integer squared is equal to 849, but the square root of 849 is 29.138 (5sf)
56.6
42.45 = 4245/100 = 849/20 = 429/20
This can be done easily by expanding 849: 849 = 800+40+9 800 = DCCC ; 40 = XL ; 9 = IX 849 = DCCCXLIX