Is sarah faster than Katie? and what is the average rate?​

Step-by-step explanation:

here's the solution: -

Average time taken by sarah :

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average time taken by sarah = 70.9 seconds

now,

average time taken by katie :

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average time taken by katie = 78.9 seconds

so, sarah is more efficient (faster) than katie.

i agree with sarah.

cuz, she took less time than katie.

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