Midpoint (-12,2) and endpoint (-3,4) find other endpoint

Ineed solving this problem h/8=-25 solve for h idk how to this can someone show me and also give an answer you

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Kayla has a $500 budget for the school party.she paid $150 for the decorations.food will cost $5.50 per student. what inequality represents the number of students,s, that can attend the party?