What property is this problem 3a + (2b - c) = (3a + 2b) - c

This problem follow the associative property.

Step-by-step explanation:

Let's recall that subtraction and division does not follow any property. However in this problem, there is also an addition. And that's the reason why we can prove and demonstrate the associative property of the addition and subtraction mixed in this problem, this way:

Let's prove for a = 1, b = 2, c = 3

3 * 1 + (2 * 2 - 3) = (3 * 1 + 2 * 2 ) - 3

3 + (4 - 3) = (3 + 4) - 3

3 + 1 = 7 - 3

4 = 4

Let's prove for a = 3, b = 4, c = 20

3 * 3 + (2 * 4 - 20) = (3 * 3 + 2 * 4 ) - 20

9 + (8 - 20) = (9 + 8) - 20

9 - 12 = 17 - 20

- 3 = - 3

Let's prove for a = 0, b = -5, c = 1

3 * 0 + (2 *-5 - 1) = (3 * 0 + 2 * -5 ) - 1

0 + (-10 - 1) = (0 + - 10) - 1

0 - 11 = -10 -1

-11 = - 11

pentagon

step-by-step explanation:

the coordinates   a(5, -2), b(3,-1),c(-4,-4) d(-3,8) and e(-1,4) forms the vertices of the polygon when they are connected in order.

in order to classify that which polygon is it with the given coordinates, first count the number of vertices and then count the number of sides it can make with these vertices.

since, the given coordinates have five vertices, therefore, it will make five sides. moreover, pentagon is regular in nature therefore it will be convex.

now, a polygon with five sides is known as pentagon, therefore, the given polygon is the pentagon.