Point p(a, b) is in the first quadrant on the graph of the line x+y=4. a triangular region is shown on the diagram. what is the maximum area of the triangular region?

4

Step-by-step explanation:

Area of Triangular region (A) = a x b

b = 4 - a  (for point (a,b) and x + y = 4)

A = a x (4 - a) = - a² + 4a = -(a² - 4a + 4) + 4 = - (a - 2)² + 4

in the formula of parabola y = a(x - h)² + k, a= -1  the graph is pointed down where h=2 and k=4

The vertex is (2, 4)

The maximum area of triangular region is 4

you need a common difference between consecutive terms to be constant, like 1,2,3,4 or 2,4,6,8, or 1,3,6,9

goog may have it for you