1. If Sylvia used a scale factor of 4 to enlarge her photo into a poster, what were the photo's original dimensions?

If the scale factor is 1/4. Then the dimension of the original photo will be 15 inches and 136 inches.
Dilation is the process of increasing the size of an item without affecting its form. Depending on the scale factor, the object's size can be raised or lowered.
There is no effect of dilation on the angle.
The scale factor will be 4.
The dimension of the poster will be 60 in. by 52 in.
Then the dimension of the original photo will be
Length = 1/4 × 60 = 15 inches
Width = 1/4 × 52 = 13 inches
If the scale factor is 1/4. Then the dimension of the original photo will be 15 inches and 136 inches.
More about the dilation link is given below.
https://brainly.com/question/2856466
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