Answer:
73.131
Step-by-step explanation:
T=
s(s−a)(s−b)(s−c)
20.9(20.9−15)(20.9−17)(20.9−9.81)
5348.14
=73.13
A is correct. √11 and √14 are both between 3 and 4.
Answer:18%
$210
30*7= 210