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?