`15 -= -3` (mod 9). (True/False)

5 -= 2 (mod 4). (True/False)

If x -= y (mod m), then 6x - 5 -= 6y - 5 (mod m). (True/False).

If a equiv b (mod n), then a^3 equiv b^3 (mod n) (write true or false).

Selling price of 9 articles is equal to the cost price of 15 articles. In this transaction there is profit of 66(2)/(3)% . (True/False)

If n(A xx B) = 15 , then the maximum possiblity of n(B) is 3 . (True/False).

1 AU=9.46xx10^15m True/False

(7x-1) is a factor of 7x^(3)+6x^(2)-15x+2 . ( True/False)

The ratio of corresponding sides of two similar triangles is 2:3 , then the ratio of the perimeters of two triangles is 4:9 (True/False).

If 59-=3 (mod 7) , 46 -=4 (mod 7) then 105 -= …. (mod 7 ), 13-=…. (mod 7) , 413-= …… (mod 7) , 368 -= ….. (mod 7).

If 15 -= 3 (mod x), then which of the following cannot be the value of x?