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

The slope is 5/4.
5²+4²=41
√41=6.4
EF=6.4 units.
Answer:
9.18
Step-by-step explanation:
2.4cm is the tangent of A