7x3^(4x-1)+7=13 help me :) (use natural logarithms)

What are the domain and range of f(x)=[1/5]x

You were told that the amount of time lapsed between consecutive trades on the new york stock exchange followed a normal distribution with a mean of 15 seconds. you were also told that the probability that the time lapsed between two consecutive trades to fall between 16 to 17 seconds was 13%. the probability that the time lapsed between two consecutive trades would fall below 13 seconds was 7%. what is the probability that the time lapsed between two consecutive trades will be between 14 and 15 seconds?

Consider the function f(x)=-5x+3 what is f(-2)