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12600 milligrams in 21 days.

Step-by-step explanation:

200 * 3 = 600 per day

21 days * 600 = 12600 milligrams in 21 days.

19 is 56

Step-by-step explanation:(4x2)x7 is 56

The third term of the sequence Tₙ = n² + 2n is:

T₃ = 15

Step-by-step explanation:

Given

As the sequence is given by

Tₙ = n² + 2n

To determine

The third term of the sequence

The third term of the sequence can be determined by substituting n = 3 in the sequence

Tₙ = n² + 2n

T₃ = (3)² + 2(3)

T₃ = 9 + 6

T₃ = 15

Therefore, the third term of the sequence Tₙ = n² + 2n is:

T₃ = 15