* 19. Alejandro wants to use the least common denominator to write equivalent fractions for 3/7 and 4/5. He rewrites the fractions as 15/35 and 20/35. How should he change his answer?
A. The numerators are correct, but the denominators should be 7.
B. 20/35 is correct, but 15/35 should be 21/25. C. 15/35 is correct, but 20/35 should be 28/35. D. the denominators are correct, but both numerators should be 12.. PLEASE ANSWER!

42

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

14.29%

step-by-step explanation: