Help pls thank you so much but please help pls help mpls thank you

What is the area of triangle abc if a = 8, b = 11, and c = 15?

Identify the converse of the following conditional: if a point is in the first quadrant, then its coordinates are positive. if the coordinates of a point are not positive, then the point is not in the first quadrant. if the coordinates of a point are positive, then the point is in the first quadrant. if a point is in the first quadrant, then its coordinates are positive. if a point is not in the first quadrant, then the coordinates of the point are not positive.

For the following geometric sequence, find the recursive formula. {-80, 20, -5, } i need : ')