Answer:
j=3 inches
Step-by-step explanation:
Since the two triangles are similar, we can set up a ratio
1in:3in
j:9in
Now we solve for j
Since the length of the side of the shorter triangle is 1/3 the length of the side of the longer triangle (as shown by the ratio 1:3 which can also be written as 1/3), we can multiply 9 by 1/3. This gives us 3.
So j=3 inches
