What is the greatest common factor of the terms in the expression 36 a + 54 a b minus 27 b? 9
9ab
18
18ab

65% of students in your school participate in at least one after school activity. if there are 980 students in you school, how many do not participate in an after school activity?

Julian wrote the following numeric pattern on the board3,10,17,24,31,38.what numbers of julian's pattern are compound numbers.

2x minus y equals 6, x plus y equals negative 3