If f(1) = 160 and f(n+1)=-2f(n), what is f(4)? someone explain how to do this

f(1) = 160

f(2) is -2  times the previous value

f(2) = -2 *f(1) = -2 * 160 =  -320

f(3) = -2 * f(2) = -2 *(-320) = 640

f(4) = -2 * f(3) = -2 * 640 = -1280

f(4) = -1280

  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.

42.4

step-by-step explanation:

convert to decimal