(HELP EASY MULTIPLE CHOICE ILL GIVE EVEN THOUGH ITS MULTIPLE CHOICE)

3.) -1

Step-by-step explanation:

Distribute the 2.

You would get

a = 9

b = 10

a - b = 9 - 10

       = -1

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

isn't it a pentagon? sense [3 (triangle) + 4 (rectangle)] - 2 (triangle and rectangle connected) = 5 (pentagon)