6.221 × 7.11 − 13.7
first we determine the product of 6.221 and 7.11 and round the value to minimum number of significant figures which is "3" since 7.11 has "3" significant figures and 6.221 has "4" significant figures
so Product = 6.221 × 7.11 = 44.2
now we do the subtraction , and round the answer to minimum decimal number
44.2 - 13.7
30.5