Question 427065
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Hi
Note:  To combine(add) must be 'Like' terms: 
In this case to the same 'power of ten' 
(which can be done by moving the decimal point)

(8.28x10^6)+(6.17x10^5)= (82.8x10^5)+(6.17x10^5)= 88.97x10^5 = 8.897x10^6
OR
 (8.28x10^6)+(6.17x10^5)= (8.28x10^6)+(.617x10^6)= 8.897x10^6