Miranda is adding the numbers below.
2.9 * 10^10 + 5.35 * 10^10
What is the sum written in scientific notation?

A. 82.5*10^-11

B. 82.5*10^11

C. 8.25*10^20

D. 8.25*10^10

Question

Miranda is adding the numbers below.
 2.9 * 10^10 + 5.35 * 10^10
What is the sum written in scientific notation?
 
 A. 82.5*10^-11
 
 
 B. 82.5*10^11
 
 
 C. 8.25*10^20
 
 
 D. 8.25*10^10

anonymous · Answer

@mathmate

kropot72 · Answer

A common factor of the two terms is 10^10, so we can write:
10^10(2.9 + 5.35) = ?

anonymous · Answer

82500000000

mathmate · Answer

" in scientific notation"
means that you would have to write the number between 1 and 10 (but excluding 10) and multiply by an appropriate power of 10.
For example, 
525000 is written as $5.25\times 10^5$ in scientific notation.