Answer:
A. add 81; 
Step-by-step explanation:
The perfect square formula

Rewrite expression
as follows:

So, to form a perfect square,
is missed.
When we add
we will get

Answer:
327 Seconds
Step-by-step explanation:
7/.75=28/3
28/3 X 35 = 327 Seconds
Answer:
70*20=1400/2= 700. that's all
Midpiont=(_2+3\2), (4+_1/2)
=2/2,6/2
=1,3