Five times a number is 21 less than twice the opposite of the number. what is the number

-3

Step-by-step explanation:

5 x = -2x -21

7x = -21

x = -3

By  opposite it means if the number is 5  the opposite is -5.

5n = -2n - 21

7n =-21

n = -3

(The number is -3 )

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.

im pretty sure it would be 5 am, hope that , and give brainliest and guys if this is right then press the button and give 5 stars