Explanation:
a. 1 nm = 10Å
683nm=683×10Å
=6830 Å
b. 1 mi/h=0.44704
520 mi/h=520×0.44704
=232.4608
c. 1 g/cm3=62.427961 lb/ft3
0.714 g/cm3=0.714×62.427961 lb/ft3
=44.573564
d. 1°C =9/5 +32 =33.8°F
-164°C = -164×9/5+32 = -263.2°F
Marks as brainest one.