erviceDate, ServiceType, ServiceCost, CarlD, Car

I need to solve the following: "ii) Suppose a book has the ISBN number 0444x50090, where the digit represented by x has been lost in transmission. What is x?" I know that for encoding there's a formula one can use but I'm confused about how to use it with the x?

a) A computer has a clock rate of 2GHz. It takes a program 10s to complete on this computer. The number of clock cycles of the program is b) A program has 1x106 instructions. The computer's clock cycle time is 250x10-12 seconds and the CPI is 2.0. Therefore, the CPU time of the program is seconds. c) We use a certain compression program as a benchmark of a certain computer system. The program has 2x10° instructions. The system has a CPI of 0.85, and a clock cycle time of 0.4x109 seconds. When we run the program, it takes 100 seconds to complete on the computer system, whereas it takes 900 seconds to complete on a reference computer. From what you know about the SPEC benchmarks, the SPECratio is