Please help me, inequalities.

How do you find the area of a triangle

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.

Ade and abc are similar. which best explains why the slope of the line between points a and d is the same as the slope between points a and b?