Respuesta :

Answer:

E. 0.23331

Step-by-step explanation:

  • 0.021 + 0.21 + 0.00021 + 0.0021

⇒ As 21 is a common factor, take the remaining as powers of 10.

  • 21 (10⁻³ + 10⁻² + 10⁻⁵ + 10⁻⁴)
  • 21 (0.001 + 0.01 + 0.00001 + 0.0001)
  • 21 (0.01111)
  • 21 x 0.01111
  • 0.23331