OG详解-OG9 数学2 Q13

The correct answer is 45. It’s given that h(0) = 45. Therefore, for the given function h, when x = 0, h(x) = 45. Substituting 0 for x and 45 for h(x) in the given function, h(x) = x+b, yields 45 = 0+b, or 45 = b. Therefore, the value of b is 45.