\text { Compute } \int_{0}^{8} f(x) d x \text { . given } f(x)=\left\{\begin{array}{ll} 4 x & \text { if } x<2 \\ 9 & \text { if } x \geq 2 \end{array}\right. a) 62 b) 16 c) -15 d) 72

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