3x - 12=18 I keep getting different answers so I wanna I be positive Wich one is right

School has 204 sixth grade students. if the sixth grade is 30% of the total school, how many students are in the middle school?

What is x3+3x2−16x−48 divided by x−1?

When are triangles considered similar? a. corresponding angles are equal andcorresponding sides are proportionalb. corresponding angles are proportional andcorresponding sides are equalc. corresponding angles are equal orcorresponding sides are proportionald. corresponding angles are proportional orcorresponding sides are equal select the best answer from the choices providedmark this and retumsave and exitnext