In the final answer of the expression 29.2−20.2 1.79 × 1051.37. The number of significant figures is

29.2−20.2 1.79 × 1051.37=9.0 ×  1.79  × 1051.37Least precise terms, i.e., 9.0 has only two significant figures. Hence, final answer will have two significant figures.