Answer:
Step-by-step explanation:

4^(12-4x)=256 realize that 256 is 4^4 so we really have:
4^(12-4x)=4^4 taking the natural log of both sides
(12-4x)ln4=4ln4 dividing both sides by ln4
12-4x=4 subtract 12 from both sides
-4x=-8 divide both sides by -4
x=2
You need to subtract 25 by 18
Krista will have more money in 2 years time than Nick and she will get $14.05 more than Nick. Hope this helps.