What exclusions are placed on the variable a for the fraction (am^2+4m)/a^2+4 my choices are: -2 0 none

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.

b

step-by-step explanation:

calculate the scale factor as the ratio of corresponding sides, image to original, that is

scale factor = = = = 1