To find the area of the postcard, we first need to determine the width of the postcard after resizing the photo.
Since the original photo measures 6 cm by 4 cm, the ratio of its length to width is 4:6 or 2:3. This means that the width of the photo is (6/4) x 4 = 6 cm.
Now, we can find the scale factor by dividing the desired length of the postcard (15 cm) by the length of the photo (4 cm):
Scale factor = 15 cm / 4 cm = 3.75
Now we can find the width of the postcard by multiplying the width of the photo by the scale factor:
Width of postcard = 6 cm x 3.75 = 22.5 cm
Finally, we can calculate the area of the postcard:
Area = Length x Width = 15 cm x 22.5 cm = 337.5 square centimeters
Therefore, the area of the postcard is 337.5 square centimeters. None of the provided answer choices match this result, so the correct option would be:
e. 337.5 square centimeters