What is the difference between x-12=y and y=x-12?

Jose predicted that he would sell 48 umbrellas. he actually sold 72 umbrellas. what are the values of a and b in the table below? round to the nearest tenth if necessary

Asix-sided number cube is rolled twice. what is the probability that the first roll is an even numbe and the second roll is a number greater than 4?

Which term describes the point where the perpendicular bisectors of the three sides of a triangle intersect?