The sum of the angles in a convex 10-sided polygon is: 1800° 188° 3600° 1440°

1440°

Step-by-step explanation:

Sum of exterior angles = 360

One exterior angle = 360 ÷ 10

                                 = 36°

Exterior angle + interior angle = 180

Interior angle = 180 - 36

                      = 144°

Sum of interior angles = 144° × 10

                                     = 1440°

no

step-by-step explanation:

2-7=-5

7-2=5

when you combing like terms for ech expression, 5 and -5. these numbers are not equal to each other.