Astudent must have an average for five test grades that is greater than or equal to 80% and less than 90% to receive a final grade of
b. gabi's grades on the first four tests were 98, 76, 86 and 92. what range of grades on the fifth test would give her a b in the course?

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