Help me please I'm really confused about this

9514 1404 393

  (b)  3π/16

Step-by-step explanation:

Point A is 3/4 of one full cycle of the function. A full cycle requires the argument of the cosine function to be 2π, so we have ...

  8x = (3/4)(2π)

  x = 3π/(2·8) . . . . divide by 8

  x = 3π/16 . . . . at point A

Convert to base 10:

10 0110₂ = 2⁵ + 2² + 2¹ = 38

Convert to base 3:

38 = 27 + 11 = 27 + 9 + 2 = 3³ + 3² + 2×3⁰ = 1102₃