No.
No, it cant because 9* any thing is not seven teen
17 - 9 = 8
153
It has to be 7x9 or 63 or less. There is no number less than 63 which is divisible by both 7 and 9 therefore 63 is the LCD.
It is: 765
No. A common multiple is a multiple of both numbers. There is no multiple of 17 that is less than 17.
No.
1
46 = 63 - 17
306
No because the lcm is 153