Answer:

Step-by-step explanation:
Using the rule of exponents
=
, then
= 
For the first one it's 90.5, I know cause I just took the test and it's right. The second one I'm not sure..
I'm not completely sure but this is what I would do.
evaluate <span>(1/ 4)^x - 1 </span>as is. But change the (1 /2)^2x to (2/4)^2x. This way both fractions have the same denominator and in this sense, the same base. The 2/4 base still evaluates into 1/2 so nothing, mathematically, is being broken here.