For this case we have the following expression:
[tex]\frac {21} {5} * \frac {19} {4}[/tex]
Multiplying we have:
[tex]\frac {21 * 19} {5 * 4} =\\\frac {399} {20} =\\19.95[/tex]
We round the expression and we have that it is equivalent to: 20.
Thus, [tex]\frac {21} {5} * \frac {19} {4}[/tex]is approximately equal to 20.
Answer:
The expression given is approximately equal to 20.
Option C
