Question

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Answer 1

$\color{Blue}{Answer:-}$

$9. \: \: 30 \: - \: 40 \: ( any \: six \: rational \: no. \: \: \: \: \: \: \: \: \: \: \: \\ can \: be \: taken) \\ 10. \: \: 3591 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ 11. \: \: four \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$

$\color{Red}{Step-by-step explanation:-}$

$<strong>9.</strong>\: \: \: \: 3 \: can \: also \: be \: written \: as \: 30 \\ (3 \times 10 = 30) \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \: \: \: \: 4 \: can \: also \: be \: written \: as \: 40 \\ (4 \times 10 = 40) \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ So, \: rational \: no. \: between \: 30 \: and \: 40 \\ = 31, \: 32, \: 33, \: 34, \: 35, \: 36, \: 37, \: 38, \: 39, \\ (between \: these \: rational \: no. \: any \: \\ six \: rational \: no. \: can \: be \: taken) \\<strong> </strong><strong>10.</strong>\: \: \: \: 57 \times 63 \: = \: (60 - 3)(60 + 3) \\ \: \: \: \: \: \: \: \: \: \: = \: 3600 - 9 \\ \: = 3591 \\ cross \: check \: = \: 57 \times 63 = 3591 \\<strong> 11.</strong>\: \: \: See \: \: the \: \: attachment \: \: plz.. \: \: \: \: \:$

Answer 2

Hope this answer will help you.