Which of the following are the functions of an OS? An OS is responsible for managing and coordinating activities on a computer. The OS delegates booting of a system to other parts of the system. The OS allocates computer memory and CPU time to various applications and peripheral devices. After this, the CPU manages the peripheral devices, while the OS acts as an interface between the user and the peripherals.
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Write a javascript program that reads three integers named start, end, and divisor from three text fields. your program must output to a div all the integers between start and end, inclusive, that are evenly divisible by divisor. the output integers must be separated by spaces. for example, if a user entered 17, 30, and 5, your program would output "20 25 30" (without the quotes) because those are the only integers between 17 and 30 (including 17 and 30) that are evenly divisible by 5.

When making changes to optimize part of a processor, it is often the case that speeding up one type of instruction comes at the cost of slowing down something else. for example, if we put in a complicated fast floating-point unit, that takes space, and something might have to be moved farther away from the middle to accommodate it, adding an extra cycle in delay to reach that unit. the basic amdahl's law equation does not take into account this trade-off. a. if the new fast floating-point unit speeds up floating-point operations by, on average, 2ă—, and floating-point operations take 20% of the original program's execution time, what is the overall speedup (ignoring the penalty to any other instructions)? b. now assume that speeding up the floating-point unit slowed down data cache accesses, resulting in a 1.5ă— slowdown (or 2/3 speedup). data cache accesses consume 10% of the execution time. what is the overall speedup now? c. after implementing the new floating-point operations, what percentage of execution time is spent on floating-point operations? what percentage is spent on data cache accesses?

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