Just do one if u want

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons

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

you didn't give me the choices, so i will just give you the graph so you can look at your choices and choose the right one.