Rick is setting up a model train track that is 5 and 3 over 5 feet long. No telephone pole is needed at the start of the track. However, along the track, he places a telephone pole every 4 over 5 foot apart. How many telephone poles does he need?

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl

answer: c

(2, -4)

goes 7 to the

(9, 4)

easy