Answer:
220
Step-by-step explanation:
If we take 20 common (as in we can take it out and group the rest) , we can say 20 (15 7/9-4 7/9) which is equal to 20 (11). 20x11 = 220.
C. y=2(1/4)^x
B is just a linear functions and the other two aren't exponential functions
You add the 4 to both sides of the equation.
Let's solve for the answer to determine if it is rational.

it is a rational number.