The sum of the interior angles of a convex n-sided polygon can be found using the formula: 360(n – 2) 180(n – 2) 180n – 2 360n

It is: 180(n-2)

For example, the sum of the interior angles of a triangle is 180 degrees.

The quadrilateral can be cut into two triangle so the sum of the interior angles of a quadrilateral is 180*2=180*(4-2)

The pentagon can be cut into three triangle so the sum of the interior angles of a pentagon is: 180*3=180*(5-2)

The hexagon  can be cut into four triangle so the sum of the interior angles of a hexagon is: 180*4=180*(6-2)

answer: the price of one pound cabbage = $ 0.8

the point (10,8) represents that the cost of 10 pounds cabbage is $ 8

step-by-step explanation:

since, here is a proportional relation between the number of pounds of cabbage (x) and the price in dollars (y).

therefore, we can write,

⇒ y = k x

where k is the constant of proportionality.

now, point (5,4) is in the line.

thus, it will satisfies the above equation of line.

⇒ 4 = 5 k

⇒ k = 0.8

thus, the equation of the line is,

y = 0.8 x

a) for x = 1,

y = 0.8

therefore, the cost of one pound of cabbage is 0.8 dollars.

b) in the below graph (10,8) represents that the cost of 10 pounds of cabbage is 8 dollars.