19. three people bought books for a total cost of $12.42. if they shared the cost equally, how much did each person pay? 20. cheryl makes $8.40 an hour. if she works 10.75 hours in a week, how much did she earn for the week? you don't have to answer both at the same time. (:

19 :4.14 dollars each

20:90.30 dollars

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