The graph of fis shown. Evaluate each integral by interpreting it in terms of areas. \text { (a) } \int_{0}^{12} f(x) d x \text { (b) } \int_{0}^{30} f(x) d

x \text { (c) } \int_{30}^{42} f(x) d x \text { (d) } \int_{0}^{54} f(x) d x