Students conducted an experiment using these steps.
Step 1: They measured the number of seconds each student took to count forward from 0 to 100.
Step 2: They measured the number of seconds each student took to count backward from 100 to U.
Step 3: They calculated the difference, in seconds, between counting forward and counting backward for
each student.
The two histograms show the differences, in seconds, for the boys and for the girls.

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

b and c

step-by-step explanation: