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:
2.5584
Step-by-step explanation:
9.84 * 0.26
= 9.84(0.2 + 0.06)
= 1.968 + 0.5904
= 2.5584
First equation: x=-y+8
Second equation: on the picture
Answer:
3) 14
Step-by-step explanation:
in the given equation replace the "g(x)" with the provided "20"
20=2(x-4) solve as usual
divide each side by 2
10=x-4
add 4 to each side
14=x
the value of x is 14