Using this information about the parts of the brain explain why someone with an addiction problem finds it so hard to stop using that substance.

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

investment b is an ordinary annuity with $3,909.64 in the account after one year.

step-by-step explanation:

17

step-by-step explanation:

51/3=17

thus 17 is your answer.