How to find A'B' of a set. Plz reply as soon as possible. I shall remain thankful for that.

Which shows the correct substitution of the values a,b and c from the equation 1=-2x+3x^2+1

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.

Due to bad planning, two of the local schools have their annual plays on the same weekend. while 457 people attend one, and 372 attend the other, only 104 people were able to attend both. how many people went to at least one play?