Answer:
C. about 18
Step-by-step explanation:
Since, We know that,
5.9 is closer to 6,
[tex]5.9 \approx 6[/tex],
And, 3.4 is closer to 3,
[tex]3.4 \approx 3[/tex]
Here, the given expression,
[tex]5.9\times 3.4[/tex]
[tex]\approx 6\times 3[/tex]
[tex]\approx 18[/tex]
Hence, the value of [tex]5.9\times 3.4[/tex] is about 18.
Option C is correct.