Answer:
None.
Step-by-step explanation:
The only possible restriction in the rational expression 
can originate in its denominator being zero for some values of a. However, since the denominator in this case (a^2+4) is always positive (and larger or equal to 4) for all values, no restrictions on the variable a exist.
First: work out the difference (increase) between the two numbers you are comparing.
Increase = New Number - Original Number
Then: divide the increase by the original number and multiply the answer by 100.
% increase = Increase ÷ Original Number × 100.
Increase = $10.25 - $9
% increase= $1.25/$9 x 100
% increase=13.888888889
% increase= 14%
the answer is B because it is 90° to the left (i guessed, srry for takin ya points dawg)
Parallel lines have equal slopes.
