Anna does sit-ups to get ready for her first triathlon. When she starts, she does a sit-up every 222 seconds. But, as she gets tired, each sit-up takes longer and longer to do. Is the number of sit-ups Anna does proportional to the time she spends doing them?

No

Step-by-step explanation:

When Anna starts, she does a sit-up every 22 seconds. As she gets tired, each sit-up takes longer and longer to do. It would mean that the number of sit ups are not proportional to the time. If any thing is proportional, the rate at which the quantity increases or decreases should be constant. But in this the rate is not constant. Also, when she gets tired, sit-up takes longer time

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