Find the fourth, sixth, and thirteenth terms of the sequence described by each
explicit formula.
15. a(n) = 6 + (n - )
16. a(n) = 12 + (n - 1)(5)
17. a (n) = -2.2 + (n - )
18. a(n) = 5 + (n - 1)(0.5)
19. a(n) = -3 + (n - 1)6)
20. a(n) = -7.6+ (n 1)(3)

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

80x^8−68x^6+16^5−20x^4−4x^3+8x^2

hope i'm right lol