Hang Tuah wrote:
I must have been missing something here. Appreciate your help.
(5^21)(4^11)=2(10^n). What is the value of n?
Gotta get good at exponents...grr Expect to see at least one of these on the GMAT. Ok here goes...
5^21*2^22=2(5^n*2^n) ---> divide the 2. 5^21*2^21=5^n*2^n
U can multiply the numbers now b/c they have the same exponents.
10^21=10^n ---> n = 21. Note you don't have to split up the 10^n to 5^n*2^n. But in my case, doings o helped me solve the problem.