Question

Help with number 12 please

Answer 1

 The fifth power of ten would not be represented. 
Each individual digit would be shown as a power of ten. 
982 would be the sum of: 
9 times 100. (100 is 10 to the second power) 
plus 
8 times 10. (10 is 10 to the first power.) 
plus 
2 times 1. (I is 10 to the zero power.) 

The only significant digit represented by a zero is the "hundred thousands" 
(100,000 is 10 to the fifth power.)