If 5^21 x 4^11 = 2 x 10^n what is the value of n?
A) 11
B) 21
C) 22
D) 23
E) 32
Can someone assist with this one? Thank you
A) 11
B) 21
C) 22
D) 23
E) 32
Can someone assist with this one? Thank you
4^11 can be written as (2^2)^11 = 2^22
10^n can be written as (5x2)^n = 5^n x 2^n
so , 5^21 x 2^22 = 2x 2^n x 5^n
= 2^n+1 x 5^n
now you can safely say that n=21
OA [spoiler]21
Hope its clear[/spoiler]
