What is the equivalent capacitance of two 5.0-nanofarad capacitors and one 750-picofarad capacitor connected in parallel?
Why Capacitors in parallel add directly, just like resistors in series, because parallel plates effectively increase the total plate area. Convert to common units first: 750 pF = 0.75 nF, so 5.0 + 5.0 + 0.75 = 10.75 nF.
Watch out The 576.9 figure comes from working the series formula (and it would be picofarads, not nanofarads); series is the reciprocal rule, which always gives a value smaller than the smallest capacitor.
Capacitors: parallel adds. Two 5s plus 0.75 = 10.75 nF. Convert pF to nF before adding.