#### Answer

The answer cannot have more significant digits than the least number of significant digits among the values provided:
(a) 13.51 + 0.0459 = 13.56
(b) 16.45/32.0 + 10 = 11
(c) 3.14 x $10^{4}$ - 15.0 = 3.14 x $10^{4}$
(d) 7.18 x $10^{3}$ / 1.51 x $10^{5}$ = 0.0475