Hope this helps but I think the answer is $8.91.
4+1 = 5
5 is the answer but you could also just subtract it a normal way
ANSWER:
10 units
EXPLAINATION:
The measure of the indicated side would be 10 units because the triangle shown here is a equilateral triangle this can be seen by the picture in which all the angles of the triangle are equal.
7,14,21,28,35,42,49,56,63,70,77,84
The answer to your question is C
