What are the missing angle values?

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.

What is the missing reason in the proof? segment addition congruent segments theorem transitive property of equality subtraction property of equality?

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents