Answer
a) 68.4 in = 174 cm
b) 94 ft = 29 m
c) 1.42 lb = 644 g
d) 248 lb = 112 kg
e) 1.85 gal = 7.00 $dm^{3}$
f) 3.72 qt = 3.52 * $10^{3}$ mL
Work Step by Step
a) 1 inch = 2.54 cm.
So 68.4 in = 68.4 * 2.54 cm = 173.736 cm.
Rounding to 3 significant figures gives 174 cm.
b) 1 ft = 0.3048 m.
So 94 ft = 94 * 0.3048 m = 28.6512 m.
Rounding to 2 significant figures gives 29 m.
c) 1 kg = 2.205 lb
1000 g = 2.205 lb
1 lb = 1000 / 2.205 g = 453.5147392 g.
So 1.42 lb = 1.42 * 453.5147392 g = 643.9909297 g.
Rounding to 3 significant figures gives 644 g.
d) 2.205 lb = 1 kg
so 1 lb = 1/2.205 kg = 0.4535147392 kg.
So 248 lb = 248 * 0.4535147392 kg = 112.4716553 kg.
Rounding to 3 significant figures gives 112 kg.
e) 1 gal = 3.78541178 L = 3.78541178 $dm^{3}$.
So 1.85 gal = 1.85 * 3.78541178 $dm^{3}$ = 7.003011793 $dm^{3}$.
Rounding to 3 significant figures gives 7.00 $dm^{3}$
f) 1.057 qt = 1 L
1.057 qt = 1000 mL
1 qt = 1000 / 1.057 mL = 946.0737938 mL
So 3.72 qt = 3.72 * 946.0737938 mL = 3519.394513 mL
Rounding to 3 signficicant figures gives 3.52 * $10^{3}$ mL
