It says 9 in. Also find the perimeter and area. If y’all could help me out that would be great.

Perimeter: 36 inches

Area: 81 inches²

Step-by-step explanation:

Hi there!

1) Find the perimeter

Apply the formula for the perimeter of a square:

where a is the side length

Replace a with 9:

Therefore, the perimeter of the square is 36 inches.

2) Find the area

Apply the formula for the area of a square:

where a is the side length

Replace a with 9:

Therefore, the area of the square is 81 inches².

I hope this helps!

- 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