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2.18 An ideal op amp with 5-k and 15-k resistors is used to create a +5-V supply from a −15-V reference. Sketch the circuit. What are the voltages at the ends of the 5-k resistor? If these resistors are so-called 1% resistors, whose actual values are the range bounded by the nominal value ±1%, what are the limits of the output voltage produced? If the −15-V supply can also vary by ±1%, what is the range of the output voltages that might be found?