jamesrwrightiii wrote:

5^12+5^13=

A. 5^25

B. 10^25

C. 6(5^12)

D. 10^12+5

E. 2 (5^12)+5

Can someone explain how to get answer?

These number properties kill me [/code]

jamesrwrightiii wrote:

5^12+5^13=

A. 5^25

B. 10^25

C. 6(5^12)

D. 10^12+5

E. 2 (5^12)+5

Can someone explain how to get answer?

These number properties kill me [/code]

5^12+5^13... hmmmm ok first advice don't try and figure out what 5^12 is.

Just take out factors. 5^12+5^13-> 5^12(1+5) 5^12(6)

Now if you were like me and didn't realize to do this in 2minutes. You could have taken the alternative approach through process of elmination and by knowing a few exponent properties.

A is clearly out you can only add the xponents w/ same base AND when they are multiplied by each other. ie 5^2*5^3=5^5

B is out for the same reason. Also it makes the mistake of adding the two 5's as well

C... couldn't say no to this, although I wanted to because of the 6.

D. 10^12+5? This choice is just silly. While it factored out the 5, to get the bases and exponents equal, you can't just add them. Same reasoning as I mentioned in A.

E. E was a bit tricky b/c it kinda made sense. however, 2(5^12)+5 is not the same as 5^12+5^13. Just try it out w/ basic numbers. (3^2)2+3 does not equal 3^2+3^3... also this suggests that somehow the original stmnt had 5^12*5^12. Clearly not the answer.

C was the only one left so I picked it. Then bout 10sec later i realized I could do what I first wrote out... doh!