Evaluate function expressions

Evaluate expressions that contain function notation, given the functions' graphs.

Problem

Functions start color blue, f, end color blue and start color red, g, end color red are graphed.
4, dot, f, left parenthesis, 6, right parenthesis, minus, 6, dot, g, left parenthesis, 5, right parenthesis, equals
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, p, i or 2, slash, 3, space, p, i