Whenever you are given a scale factor, that factor will apply to each dimension and because area is a two dimensional measurement, you multiply the area by 5 twice (so x5 x5). This means the new area would be 154x5^2. The new area of the photograph is 3850 square inches.
Whenever you have a root of sqrt #, you must have the matching - (or positive). This is because when you take a square root you get two solutions a positive and a negative. The answer is LETTER A
