Find the length of FN is 20*pie ft. what is the radius round your answer to the nearest 10th

9514 1404 393

  26.67 feet

Step-by-step explanation:

The arc length is given by the formula ...

  s = rθ . . . . . . where r is the radius and θ is the angle in radians

Here, the angle is 360° -225° = 135° = 3π/4 radians

Filling in the known information, we have ...

  20π = r(3π/4)

  r = 80/3 . . . . . divide by the coefficient of r

  r ≈ 26.67 . . . . feet

hello from mrbilldoesmath!

answer:

a(n) - a(n-1) -3

discussion:

this ones a bit interesting. given a(n) = 5 - 3n consider this:

a(n-1) = 5 - 3(n-1)

          = (5 - 3n) + 3             => but a(n) = 5 - 3n, the first term

          = a(n)   + 3                 => subtract 3 from both sides

a(n-1) -3 = a(n)  

or

a(n) - a(n-1) -3

you,

mrb