Polygon with four sides, and the sum of the interior angles is equal to 360 degrees

I'm assuming your asking the length of each side. If so, each side is 90 degrees. If not, you should be more specific

Step-by-step explanation:

360 degrees divided by 4 sides equals 90 degrees for each side.

- 2 + 10x³ - 21x² + 19x - 4

step-by-step explanation:

each term in the second factor is multiplied by each term in the first factor

x²(- 2x² + 4x - 1) - 3x(- 2x² + 4x - 1) + 4(- 2x² + 4x - 1) ← distribute

= - 2 + 4x³ - x² + 6x³ - 12x² + 3x -8x² + 16x - 4

collect like terms

= - 2 + 10x³ - 21x² + 19x - 4 ← in standard form

70

step-by-step explanation:

2*5=10

4*15=60

60+10=

70