Algebra 1 grade 9.
can anyone me answer this question?

the brightness of a star is measured in magnitudes. the lower the magnitude, the brighter the star. a magnitude 9 star is 2.51 times as bright as a magnitude 10 star. a magnitude 8 star is 2.51 * 2.51 or (2.51)2 as bright as a magnitude 10 star.

(note: 10 - 8 = 2. get it? )

a. how many times as bright is a magnitude 3 star as a magnitude 10 star?

b. write an expression to compare a magnitude m star to a magnitude 10 star.

c. a full moon is magnitude -13, approximately. does your expression make sense for this magnitude? explain.