1. Circle ALL of the relations that represent functions.

left relation only

Step-by-step explanation:

The left relation is a function since each number of the left set is used only once.

In the middle relation, the -9 is used twice. In the relation at the right, the 0 is used twice. That makes those two relations not functions.

answer: plz put a pic in so i can answer it

step-by-step explanation:

option a is correct.

step-by-step explanation:

scale factor: it is used to find proportional measurements.

proportions means having the same ratio.

scale factor is the ratio of the model measurement to the actual measurement in a simplest form.

or we can say that the ratio of any two corresponding lengths in two similar geometric figures

if the scale factor is more than 1, then it is an enlargement,

if the scale factor less than 1, then it is a reduction.

given the two geometric figure:

by definition of proportions, we have