Problem 1-34

Any conversion factor is considered as "infinitively" precise

example:

Length
  1 in = 2.54 cm (infinitively precise)
  Therefore: in 7.22356 cm (6 s.f.) there is:
  7.22356 cm × 1 in / 2.54 cm = 2.84392 in (6 s.f.)


Temperature conversion
  2.0055 °C + 273.15 = 275.1555 K (yes! 7 s.f.)