List all possible rational roots of x4 – 13x3 – x + 15 = 0. ±1, ±15

1, 3, 5, 15

±1, ±3, ±5, ±15

±1, ±1/3, ±1/5, ±1/15

  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.

what do you need me to answer?

step-by-step explanation:

answer is x<

my guess would be b and d, but i didn’t actually get out the pen and paper. lol