1.after a dilation with a center of (0, 0), a point was mapped as (1, 4) → (4, y). a student determined y to be 16. evaluate the student's answer.

a.
the student is correct.
b.
the student incorrectly calculated the scale factor to be 4.
c.
the student incorrectly multiplied by the scale factor instead of adding it.
d.
the student incorrectly added the scale factor instead of multiplying by it.

2.under a dilation centered at the origin, the image is congruent to the preimage. what is the scale factor?

a.
–1 or 0
c.
only 1
b.
0 or 1
d.
–1 or 1