Plsss help thank you so much

^arithmetic sequence^

an= -3n + 21

a102=

an= -3n + 21

a102= -3(102) + 21

= -306 + 21

= -285 (b)

  21.3

step-by-step explanation:

multiplying the given equation by c/sin(25°), we get

  c = 9/sin(25°) ≈ 21.2958 ≈ 21.3

we assume "c" is the length of ab, the side opposite angle c in triangle abc.

i would have to say it is c.