Answer:
$5.39
Step-by-step explanation:
In order to solve for this equation, we are going to multiply 7.70 by 0.3 to find how much money was taken which was 2.31.
Subtract2.31 from 7.70 to recieve your new price :)

Hope this Helps!
Both exponential i.e 5 ^x
A is true, surprisingly.
B cannot be true, it alternates.(rule of indices negatives by positive exponent = positive, negative by negative , but -5 x -5 x -5 = + 5)
I'm only imaginging, but C must be right, since it increases exponentially, as opposed to D which only increases quadratically.
Log(k + 2k) = log60 - log4
for two functions to be equal, the arguments of each must be equal
k = 5