Here it is...........................
Are you sure it’s b or is it x?
Answer:
your answers obviously 210
Answer:
The area of the triangle is of 21 units of area.
Step-by-step explanation:
The area of a triangle with three vertices
is given by the determinant of the following matrix:

In this question:
Vertices (3,0) (9,0) (7,6). So




The area of the triangle is of 21 units of area.
Let the measure of an angle be "a"
let the supplement be "s"
a= s-23