Find the Side length x

Which of these equations, when solved, gives a different value of x than the other three? a9.1 = -0.2x + 10 b10 = 9.1 + 0.2x c10 – 0.2x = 9.1 d9.1 – 10 = 0.2x

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?

1yd 1 ft = 1 1/12 1 1/3 1 1/2 1 1/6