Respuesta :

Answer:

1.21 * 10^25.

Step-by-step explanation:

11 *10^11 * 12 * 10^2

= 11*12 * 10^11 * 10^12

= 121 * 10^(11+12)

= 121 * 10^23

= 1.21 * 10^25.

Note: True Scientific notation is N * 10^n   where  1 ≤ N <  10.

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