Respuesta :

Answer:

  1. A is area, s is side, w is width
  2. A = 104 in²
  3. $3,600

Step-by-step explanation:

For #2:

[tex]A = 15^{2} - (15 - 2(2))^{2}\\A = 225 - (15 - 4)^{2}\\A = 225 - 11^{2}\\A = 225 - 121\\A = 104[/tex]

For #3:

[tex]A = 18^{2} - (18 - 2(3))^{2}\\A = 324 - (18 - 6)^2\\A = 324 - 12^2\\A = 324 - 144\\A = 180[/tex]

Then the price would be 180 in² × 20 = $3,600.